I started doing this in the How was your commute thread, but I'll go into more detail here.
I didn't enter this year with much in the way of expectations. In 2014, I had a little over 200 miles on Divvy bike share bikes between my office and the train station. In April, 2015, I started commuting by bike from home to the train station, and only missed a few commuting opportunities after that. I will end the year with a little less than 3,000 miles.
The breakdown:
Total Miles: 2821.8
Commuting miles: 2571
Non-Commute miles: 250
Divvy miles: 371
Potential ride days(not PTO or holiday): 159
Days ridden: 141
I think I did pretty well in 2015!