Release date is moot, it is more important when an album achieves peak cultural influence.
60.00% - 2001 was released in 1999 and doesn't qualify for best-of-the-2000s arguments — chronological integrity matters if decade rankings are going to mean anything.
40.00% - 2001 peaked in December 1999 — it's not an aughts album, and however good it is, it belongs in the 90s conversation, not the 2000s.
0.00% - Release date is moot, it is more important when an album achieves peak cultural influence.