I decided to compile all the UFC fights into a single dataset, though there's a bit of missing data (usually the time that a fight ends).  I'm still messing around with everything and thought I'd share some initial results.  Here's a breakdown (by percentage) of how UFC fights have ended since 1993.

You'll notice that the number of fights have increased dramatically in recent years.  From only 80 fights five years ago, we've already seen 136 fights in 2010... and we're only halfway through the year.

The other thing you might notice is the 10-15% increase in decisions over the last two years.  However, you should keep in mind that this number represents all UFC fights, not just the ones that have been televised.  I hope to eventually put together the data so that I can break down results by televised card (which may drive these numbers up or down).

Two quick notes.  (1) Data is from Sherdog Fight Finder.  (2) Number may not add up to 100 due to rounding error but should be very close.