Even the Obama admin admitted to over 500 drone strikes, killing over 2,400 people and up to over a hundred civilians. These stats are from strikes in Pakistan, Yemen, Somalia and Libya and don't include the strikes against countries like Iraq, Afganistan and Syria.
http://www.pbs.org/newshour/rundown/obama-to-disclose-how-many-civilians-died-in-u-s-drone-attacks/