The literacy rate of Niger is among the lowest in the world; in 2005 it was estimated to be only 28.7% (42.9% male and 15.1% female). Primary education in Niger is compulsory for six years. The primary school enrollment and attendance rates are low, particularly for girls. In 1997, the gross primary enrollment rate was 29.3 percent, and in 1996, the net primary enrollment rate was 24.5 percent.