girls : Demographics

Slightly more boys are born than girls (in the US this ratio is about 105 boys born for every 100 girls), but girls are slightly less likely to die than boys, during childhood, so that the ratio for under 15 years of age is 104 boys for every 100 girls.^[4][5] Since the 18th century the human sex ratio has been observed as about 1,050 boys for every 1,000 girls born and sex selection on the part of parents further lessens the number of female births. Although the International Covenant on Economic, Social and Cultural Rights has asserted "primary education shall be compulsory and available free to all" girls are slightly less likely to be enrolled as students in primary and secondary schools (70%:74% and 59%:65%). Worldwide efforts have been made to end this disparity (such as through the Millennium Development Goals) and the gap has closed since 1990.