user: Question: Name the number of season for 18th position
Columns: ['Season', 'Series', 'Team', 'Races', 'Wins', 'Poles', 'F/Laps', 'Podiums', 'Points', 'Position']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: ['2008', 'Formula Renault 2.0 WEC', 'Epsilon Euskadi', 15.0, 0.0, 0.0, 1.0, 0.0, '30', '9th']
SQL:

assistant: SELECT COUNT("Season") FROM "Table" WHERE "Position" = '18th';