Adsense earning drop down

Hi here, do you notice that since Google launched "AD based on user interests", the Adsense earning is dropping down? Last month I earned $30+, but this month(till now) is less than $7! It was not I didn't post articles regular! The PV was increased, but CTR and eCPM dropped down, down, down!!

 

For me it seems to be the same. But my earnings this year us down 50% from last year