If you look at the harvest statistics on the IDFG website, the success has been bouncing a lot. In '10 it was 14%, '11 was 10%, '12 was 21%, and '13 was 15%. '14 numbers won't be up for a few months.
Starting about '10, hunter numbers have dropped by 1/2 to 2/3 and harvest has gone from averaging 20 to 25% down to those numbers.
