Evidence that shows Google is cutting back on AdSense publisher's revenue share.

First of all, before I start, I'm not a financial expert, so I may have read or understood the information incorrectly. If you are more knowledgable in this field, and you spot something wrong with my calculations, please let me know.

All my data comes from http://investor.google.com/fin_data.html.

There's been talk of how Google seems to be dropping the amount of money publishers earn for each adsense click. Much of talk came from publishers looking at their adsense stats and noticing changes in their earnings over time. I wondered if there was more concrete evidence of this, and after digging through Google's financial data, came up with the folling findings. I think the information is an average of everything since I'm pretty sure they don't pay all publishers the same percentage. However it's interesting to note that there's a 7.85% difference in the % revenue share from the 2003 Q1 high of 86.35% and the current 2005 Q3 figure of 78.36%

Google network web sites Revenue
Revenue Shared - TAC
% AdSense Revenue Shared
2003 q1 $81,218.00 $70,131.00 86.35%
2003 q2 $117,583.00 $96,559.00 82.12%
2003 q3 $174,444.00 $143,487.00 82.25%
2003 q4 $255,354.00 $216,356.00 84.73%
      83.86% Avg % Shared
2004 q1 $333,752.00 $271,002.00 81.20%
2004 q2 $346,226.00 $277,034.00 80.02%
2004 q3 $384,285.00 $302,932.00 78.83%
2004 q4 $489,993.00 $377,708.00 77.08%
      79.28% Avg % Shared
2005 q1 $584,115.00 $461,807.00 79.06%
2005 q2 $630,242.00 $494,320.00 78.43%
2005 q3 $675,012.00 $529,874.00 78.50%
      78.66% Avg % Shared