user: Question: How many series awarded 15 points?
Columns: ['Season', 'Series', 'Team', 'Races', 'Wins', 'Poles', 'F/Laps', 'Podiums', 'Points', 'Position']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: [2007.0, 'Formula Renault 1.6 Belgium', 'Thierry Boutsen Racing', 4.0, 0.0, 0.0, 0.0, 0.0, '0', 'NC']
SQL:

assistant: SELECT COUNT("Races") FROM "Table" WHERE "Points" = '15';