They aren't, most are scored from open play.
Massimo Palanca is an Italian soccer player who holds the record for the most corner kicks as of 2014. He actually had 13 goals directly from corner kicks.
145 goals
32%
David Beckham is amazing and famous for bending soccer balls. I know it seems silly, but he bends it alot more than others. He can score from corner kicks and scored many game winning goals.
Seven free kicks
Corner Kicks Taken!
about 1 in 40
70
2
He has scored 72 goals from free kicks.
There is no such thing as a "Direct Goal Kick." Goals can be scored from Goal Kicks Goals can be scored from Direct Free Kicks According to FIFA Laws of the Game
The most common statistics kept in soccer are: Games Played, Goals, Assists, Points, Fouls, Cards, Ejections, Shots On Goal, Corner Kicks, Saves and Blocks.