Diablo 3 release date pattern (if there is such) seems to be cracked

Diablo X seems to have cracked the Diablo 3 release date pattern:

So if you look back at Diablo I, that was released in 1996 and Diablo 2: LoD (Lords of Destruction) in 2001, and lets set Diablo III release date 2011, it would fit exactly 15 year anniversary for Diablo I & 10 Year for Diablo 2:LoD.