Baku city is the top region by number of students studying by phd program in Azerbaijan. As of 2012, number of students studying by phd program in Baku city was 1,296 that accounts for 80.95% of Azerbaijan's number of students studying by phd program. The top 5 regions (others are Ganja-Gazakh, Absheron, Nakhchivan, and Lankaran) account for 99.94% of it. Azerbaijan's total number of students studying by phd program was estimated at 1,601 in 2012.