user: Question: When 2005 is the season how many drivers are there?
Columns: ['Season', 'Date', 'Driver', 'Team', 'Chassis', 'Engine', 'Laps', 'Miles (km)', 'Race Time', 'Average Speed (mph)', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1996-97', 'June 7, 1997', 'Arie Luyendyk *', 'Treadway Racing', 'G-Force', 'Oldsmobile', '208', '312 (502.115)', '2:19:48', '133.903', 'Report']
SQL:

assistant: SELECT COUNT("Driver") FROM "Table" WHERE "Season" = '2005';