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As one might expect, the proportion of transnational students varies by age and grade. Graphic 1 shows that the proportion with U.S. school experience increases in higher grades. Students in the first three years of primaria averaged one in a hundred with U.S. school experience. Students in the final three years of primaria had a 1.5% U.S. school experience prevalence. And, two out of every one hundred in secundaria had previous U.S. school experience6.