Explanation of Responses:
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(1)
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These shares were retained by the Company and not issued, in satisfaction of withholding payroll tax requirements applicable to vesting of the Restricted Stock Awards originally granted on February 8, 2016.
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(2)
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These shares were retained by the Company and not issued, in satisfaction of withholding payroll tax requirements applicable to vesting of the Restricted Stock Awards originally granted on February 10, 2017.
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(3)
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These shares were retained by the Company and not issued, in satisfaction of withholding payroll tax requirements applicable to vesting of the Restricted Stock Awards originally granted on March 6, 2015.
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(4)
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The transactions reported on this Form 4 were effected pursuant to a Rule 10(b)5-1 trading plan adopted by the reporting person on November 16, 2017.
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(5)
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The sales price represents the weighted average sales price ranging in price from $216.870 to $217.850. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(6)
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The sales price represents the weighted average sales price ranging in price from $217.880 to $218.860. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(7)
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The sales price represents the weighted average sales price ranging in price from $218.920 to $219.890. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(8)
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The sales price represents the weighted average sales price ranging in price from $219.940 to $220.880. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(9)
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The sales price represents the weighted average sales price ranging in price from $220.950 to $221.940. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(10)
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The sales price represents the weighted average sales price ranging in price from $221.955 to $222.960. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(11)
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The sales price represents the weighted average sales price ranging in price from $222.970 to $223.950. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(12)
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The sales price represents the weighted average sales price ranging in price from $224.000 to $225.000. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(13)
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The sales price represents the weighted average sales price ranging in price from $225.090 to $225.850. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(14)
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The sales price represents the weighted average sales price ranging in price from $226.240 to $226.300. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(15)
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The sales price represents the weighted average sales price ranging in price from $223.370 to $224.370. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(16)
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The sales price represents the weighted average sales price ranging in price from $224.385 to $225.385. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(17)
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The sales price represents the weighted average sales price ranging in price from $226.395 to $226.385. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(18)
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The sales price represents the weighted average sales price ranging in price from $226.395 to $227.310. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(19)
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The sales price represents the weighted average sales price ranging in price from $227.420 to $228.360. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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(20)
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The sales price represents the weighted average sales price ranging in price from $228.500 to $229.420. The number of shares sold at each separate price will be made available to the SEC Staff, the issuer, or a security holder of the issuer upon request.
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