Schiman from across the street ran some figures from 2009 (816) games..... here is what he posted.
Here's the table again:
Team W % Total W%
7 58.5% 47.0%
8 60.3% 46.8%
9 59.9% 47.0%
10 59.8% 48.0%
11 59.5% 47.3%
12 60.3% 50.0%
13 63.0% 55.5%
14 58.7% 55.0%
15 57.5% 53.8%
16 64.0% 54.9%
17 65.6% 57.1%
18 68.6% 57.7%
19 66.7% 59.5%
20 64.5% 61.1%
21 56.5% 65.6%
22 52.9% 63.2%
-playr101