user: Question: What year has WSC class?
Columns: ['Year', 'Team', 'Co-Drivers', 'Class', 'Laps', 'Pos.', 'Class Pos.']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [1994.0, 'Courage Compétition', 'Henri Pescarolo Alain Ferté', 'LMP1 C90', 142.0, 'DNF', 'DNF']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Class" = 'WSC';