While Russia's overall population is dropping, the number of Muslims in the country is on the rise. The population of indigenous Muslims, mainly hailing from the Russian Caucasus, in Russia has risen since the fall of the Soviet Union, including a 69 percent increase in Dagestanis, a 50 percent increase in Chechens and a 100 percent increase in Ingush. Similarly, the number of Muslim immigrants is also rising. According to official state data, some 240,000 immigrants enter Russia annually — Russia's Center for Migration Studies puts this number at more than 400,000 after accounting for illegal immigration. Federal Migration Service head Konstantin Romodanovsky has said 3 million immigrants work illegally in Russia every year. Increased anti-Muslim and anti-immigrant sentiment has accompanied these demographic changes.