I decided to chart Nikon's DX introductions to see what that showed. This is a little tricky, as I have a couple of subjective decisions in the data. In particular, I've classified the D7000 body as consumer, the 35mm and 85mm DX lenses as prosumer. These two decisions could be argued to go the opposite way. But it really doesn't make much difference to the overall results. Here's what things look like (the lines are a two-year moving average):
See the loud thunk prosumer DX made (and it would have been bigger if I'd taken those two lenses and classified them consumer)? Even consumer DX seems to be a bit off when looked at this way, though the Thailand floods certainly affected the DX schedule a bit (late 2011 and early 2012).
Obviously, you'll want to see the same thing for FX (you can't quite call lower end FX consumer, so I've labeled it prosumer):
The pre-2007 items are all lenses, but note the spike of pro activity with the release of the D3 in 2007 (which correlates with a the highest DX consumer activity). 2011 has to be considered an anomaly, as the earthquake shut both the FX body and lens plants and changed product introductions for FX gear. We'll get some more 2012 announcements soon, and the 2011 gap will become even more obvious.