Ratings: American Idol down 4% from last week

The ratings of American Idol are stable again. I should stop worrying now. Looks like this season is definitely a winner.
Idol's biggest competition for the hour Big Bang Theory was down 9% from last week. Thursday has been conquered!
From TVbytheNumbers:
American Idol’s 7.2 adults 18-49 rating was 4% lower than last Thursday, and just 8% behind last season’s fourth Wednesday’s 7.8 rating, far less than the typical (10-15%) annual declines.