PBP Stats
The 2015 stats are not online just yet; when the official site will have them, I will update this site too

I did grab some data already. To see a breakdown by country, click here.
here is some basic/initial info grouped by the start time :
Letter Started Finished
Complete under time limit
OTL
Over the time limit
DNF/Abandon
Did not Finish
Success Ratio
Started vs Finished
1A220 195 2 23 88.6%
2B232 197 5 30 84.9%
3C248 197 1 50 79.4%
4D251 198 4 49 78.9%
5E253 194 8 51 76.7%
6F216 156 2 58 72.2%
7G334 243 16 75 72.8%
8H335 241 14 80 71.9%
9J329 258 11 60 78.4%
10K327 240 10 77 73.4%
11L323 247 6 70 76.5%
12M326 252 8 66 77.3%
13N331 252 13 66 76.1%
14P329 243 10 76 73.9%
15R323 241 12 70 74.6%
16S333 227 16 90 68.2%
17T327 241 14 72 73.7%
18W31 20 0 11 64.5%
19X290 257 0 33 88.6%
20Y262 203 4 55 77.5%
21Z200 164 0 36 82.0%
 
Totals5,820 4,466 156 1,198 76.7%


For the 2011 stats (some of the data is no longer onine), click here.