The Female Empowerment Index for Nigeria at the national (boxplot) and state level (maps) between 1990 and 2013, computed as the equally-weighted average of the six FEMI categories (violence against women, employment, education, reproductive healthcare, decision making, and access to contraception). Boxplots were made using state level data, but with the median (thick horizontal bar) adjusted for population size to better reflect the true national median.