I do not have any cold hard facts but I'm going to give an educated guess by what I've seen though the 30 years I've watched baseball.
Swinging Strike Outs - 75%
Caught Looking Strike Outs - 24%
Bunting Foul Strike Outs - 1% (AL = 0.5% / NL = 1.5% / Total = 1%)
Lou Piniella Arguing a Strike Out = 100% for a meltdown