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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
CONSOLIDATED STATEMENTS OF EQUITY |  |  |  |
Issuance of shares of common stock upon exercise of stock options | 2,000 | 2,200 | 2,000 | 14,700
Purchase of shares of common stock | 8,542 | 261 | 28,393 | 73,183
Dividends declared on common stock (dollars per per share) | $ 0.17 | $ 0.17 | $ 0.51 | $ 0.51

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