Looking at the size of the folders (organized by year), it's interesting to see the increase in size. There is not necessarily an increase in number of images in each folder from year to year, but there's definitely an increase in size. And it's mostly due to the upgrade path of the cameras that I've owned.
I started with a 1.3 MP camera (shooting JPG), and now it's 22 MP shooting mostly raw images.
a) Canon Digital Rebel (6 MP)
b) Canon 20D (8 MP)
c) Canon 5D (12 MP)
d) Canon 5D2 (21 MP)
e) Canon 5D3 (22 MP)
f) new toy: Sony action cam (lots of video and time lapse)