I started AdSense 2004.
My absolut records had been more than 10 times the earnings of my first month.
Since March 2011, less and less visitors from Google.
December 2011, I tried a complete redesign of the site.
First time, the redesign was good visible at Googla Analytics stats.
About 40% more page views per user, longer on the site,
the useability for cell phone users was so good improved,
they are now nearly the same as normal visitors.
But still declining
2 weeks ago, I discovered, that only my google plus pages are in the webmaster toole with me as author.
It turned out, that the method in the html head proposed before did not work.
So I made the author link in the content.
Now day for day, the number of pages registered with me as author increaded.
But the number of visitors from Google again decreased.
When it goes on like this, my earnings will be end of the year in the range of my first month 2004