Why does the report date range include 2001?

Just wondering...

[saoi_jp]

I've often wondered why the AdSense Ad Performance section gives a Date range as far back as 2001. I thought the program started around June 2003.

[FromRocky]

AdSense program started earlier than June 2003. According to Google:

Adsense for search, launched in the first quarter of 2002, is our service for distributing relevant ads from our advertisers for display with search results on our Google Network members’ sites. Adsense for content, launched in the first quarter of 2003, is our service for distributing ads from our advertisers that are relevant to content on our Google Network members’ sites.