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Adjusted net enrollment rates in primary education measure the proportion of children of official primary school age who are enrolled in any level of education. Although higher values indicate that more children of primary school age attend school, these rates do not capture issues such as repetition and late enrollment, as long as children enter school before the official age of completion. For all regions except Sub-Saharan Africa, net enrollment ratios met or exceeded 90 percent in 2006. In Sub-Saharan Africa, the rate only rose from 58 to 71 percent from 1990 to 2006.