http://images.wikia.com/wowwiki/imag...PtoLevel23.png

http://www.wowwiki.com/Formulas:XP_To_Level

Not that that's exactly what you're looking for XD

3,378,400 to get to 60
6,762,300 from 60 to 70 lol

Tempted to go find the XP per kill by level formulas ( http://www.wowwiki.com/Formulas:Mob_XP ) and open Excel and graph out how many kills per level... but... not today...