File:20-year trends in mathematics achievement, Grade 4.svg
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![File:20-year trends in mathematics achievement, Grade 4.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/20-year_trends_in_mathematics_achievement%2C_Grade_4.svg/512px-20-year_trends_in_mathematics_achievement%2C_Grade_4.svg.png?20171115134210)
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