Sure, here you go:
1. Source of number of visas issued in each year:
here
2. Source for 2014 max CN is at Britsimon's site,
here. That data was extracted by a script that mines the Department of State's CEAC website. The highest called CN in 2014 was 1448
3. The 2013 max CN is trickier. You'll find it if you search for 2013 DV CEAC data on google and do some sifting. It was, however, very close to 1630.
Good luck! And if you are drawn in DV 2016, you want your number to be below 1400. I'm praying for this very thing to happen to me!