Going by Lightroom, I've taken 2,837 shots with my 30mm f/1.4, then 2,155 with my 18-200mm, then a massive drop to 847 with my 50mm f/1.8 in third place. That seems spot-on, the 30 and 18-200 are the only things I take with me 99% of the time I take my camera out (excluding newspaper stuff).
Least-used is my 24-70, but that's only because it's newest. The lens with the lowest shots:time owned ratio is probably my 10-20: I love it, I just rarely have cause to use it.