The above graph shows changes in school enrollment rates of the population ages 3－19 by age group from 1970 to 2006. ①The enrollment rates of all age groups were higher than 50 percent in 2006. ②Of all age groups, the enrollment rate for youth ages 7－13 was the highest during the entire period covered by the graph. ③Of all age groups, the enrollment rate of children ages 5－6 increased the most from 1970 to 2006. ④The overall change in the enrollment rate from 1980 to 1990 was smaller for youth ages 14－17 than for youth ages 18－19. ⑤The lowest enrollment rate is seen in children ages 3－4 among all age groups for each year.

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