Account all dividends in your adjusted closing prices. SPY returned 21.7% in 2017, not 21.1%.
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Victor Norton
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Victor Norton commented
I am glad to see that Yahoo has now included SPY's 2017-12-15 distribution. I just checked. I see they now have 2017-12-15 distributions for all 10 Sector SPDR Funds as well.
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Victor Norton commented
I'm sorry. The figure I quoted was for XBI. SPY distributed $1.351333 per share on Dec 15, 2017. Yahoo's adjusted closing prices have neglected this into the second week of 2018. Who knows how many Dec 15 SPDR distributions Yahoo is missing.
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Victor Norton commented
SPY distributed $0.03473 per share on 2017-12-15, which Yahoo had not recorded when I posted the comment.