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YearNumber sharesCostAverage per-share cost
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200517,600,000$1,300,000,000$74
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20063,900,000$215,400,000$55
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20074,600,000$215,200,000$47
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20082,300,000$72,800,000$32
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20114,900,000$53,000,000$11
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Total33,300,000$1,856,400,000$56
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