File:20-year trends in mathematics achievement, Grade 8.svg
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![File:20-year trends in mathematics achievement, Grade 8.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cc/20-year_trends_in_mathematics_achievement%2C_Grade_8.svg/512px-20-year_trends_in_mathematics_achievement%2C_Grade_8.svg.png?20171115134218)
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