File:12-year trends in mathematics achievement, 15-year-olds.svg
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![File:12-year trends in mathematics achievement, 15-year-olds.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/12-year_trends_in_mathematics_achievement%2C_15-year-olds.svg/512px-12-year_trends_in_mathematics_achievement%2C_15-year-olds.svg.png?20171115134219)
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