Release Dates and Money

2002
3/28/02 Kingdom Hearts Japanese Release Date
9/17/02 Kingdom Hearts North American Release Date
12/26/02 Kingdom Hearts: Final Mix Japanese Release Date

2004
3/17/04 4,000,000 Copies Sold (world data)
(1,230,000 Japan; 2,000,000 N.A.; 820,000 Europe)
11/11/04 Chain of Memories Japanese Release Date
12/7/04 Chain of Memories North American Release Date

2005
2/1/05 1,000,000 Copies Sold (Chain of Memories); 5,000,000 (total)
12/22/05 Kingdom hearts II Japanese Release Date

2006
3/28/06 Kingdom Hearts II North American Release Date
12/28/06 10,000,000 Copies Sold (world data)
KH: 1.5 mil Japan; 3.0 mil N.A.; 1.1 mil Europe
COM: 0.4 mil Japan; 0.9 mil N.A.; 0.2 mil Europe
KHII: 1.1 mil Japan; 1.7 mil N.A.; 0.7 mil Europe

2007
3/29/07 Kingdom Hearts II: Final Mix+ Japanese Release Date
(Re: Chain of Memories Japanese Release Date)

2008
12/2/08 Re: Chain of Memories North American Release Date

2009
5/30/09 Kingdom Hearts 358/2 Days Japanese Release Date

Notes:
Unfortunately, the different Japanese editions are not separated out for sales diffence. It is unknown how much of the sales have been the original compared to the Final Mixes. Similarly, Platinum and other cheap releases are undifferentiated.

Sources:
Chihiro. "キングダムハーツ年表." KH-Informationキングダムハーツ2ファイナルミックス+情報Blog. Posted: March 31, 2005. Updated: December 16, 2006. Accessed: July 17, 2009. .
Gamespot. "Kingdom Hearts Series Ships over 10 Million Worldwide." Posted: February 5, 2007. Accessed: July 17, 2009.