Brooks Baseball, with help from The Hardball Times, has created pitch f/x player cards. If you play around with Matt Garza's card you'll see that in his career he's thrown 4-seam fastballs 41% of the time. He threw the same amount in 2011 (40%), but the big difference was in sinker frequency. It's 26% in his career, but only 15% last year. His slider frequency is 16%, but it was 23% last year. He through roughly the same amount of curve balls, but fewer changeups.
The graphics included on that page are awesome. Links to a few other Cubs pitchers are listed below.