user: Question: In what year did the team compete in the USISL Pro League?
Columns: ['Year', 'Division', 'League', 'Regular Season', 'Playoffs', 'Open Cup']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1996.0, 3.0, 'USISL Pro League', '6th, Northeast', 'Did not qualify', 'Did not qualify']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "League" = 'USISL Pro League';