Population : Hazaras - 19%,  Tajik - 25%, Pushtun - 38%, Uzbek - 6% 
Note:  Hazara sources estimate the Hazara population to be much higher than 19%. It should be noted that there has never been a census in Afghanistan. Also many existing maps have been influenced by Pushtun dominated governments of Afghanistan.  

Compliments of  www.hazara.net/hazara/geography/ethnic/ethnic.html.