There are two eras so far:
1) Pre-1.05 (prior to the first balance patch)
2) 1.05 (prior to the second balance patch)
with post-1.05 coming (1.06 games).
The numbers in parantheses are compared to the pre-1.05 games, statistics below. The standard deviation for winning percentage was 3.971 (using Excel's STDEVP function). This is slightly below the standard deviation for the eight weeks prior to the 1.05 patch (4.003). In other words, it appears that 1.05 balancing did some good. It should be noted that the complete 1.05 timeframe is included here, even though the early weeks probably saw many people using old strategies that didn't leverage the patch's changes. Below is the pre-1.05; however, these stats represent "only" the final 8 weeks of 1.04. That time period should be fairly representative of the civs prior to the first balance patch. [This message has been edited by SwiftAero (edited 04-14-2006 @ 08:04 AM).]
54.33% (-0.80)
54.17% (+6.25)
52.58% (+3.86)
52.51% (+2.76)
49.99% (-2.30)
49.58% (-0.55)
47.41% (-4.74)
41.58% (+0.92)
55.13%
52.29%
52.15%
50.13%
49.75%
48.72%
47.91%
40.66%