user: Question: When did the MetroStars have their first Rookie of the Year winner?
Columns: ['Season', 'Player', 'Position', 'Nationality', 'Team', 'Draft Pick #', 'Draft Class', 'College']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1996.0, 'Steve Ralston Category:Articles with hCards', 'Midfielder', 'United States', 'Tampa Bay Mutiny', '18', '1996 MLS College Draft', 'Florida International']
SQL:

assistant: SELECT MIN("Season") FROM "Table" WHERE "Team" = 'MetroStars';