The size of the ENDF has fluctuated significantly since the end of the Ethiopia-Eritrea war in 2000. In 2002 the Ethiopian Defense Forces had a strength of approximately 250,000-350,000 troops. This was roughly the same number maintained during the Derg regime that fell to the rebel forces in 1991. However, that number was later reduced, and in January 2007, during the War in Somalia, Ethiopian forces were said to comprise about 300,000 troops. In 2012, the IISS estimated that the ground forces had 135,000 personnel and the air force 3,000.