Ok, just checked Wiki,
March 31st 1998.
So it came out Over 10 years ago, 6 months after Goldeneye, and 6 months before OoT...
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut