user: Question: how many vehicles where top 13 time is 1:18.72
Columns: ['Pos', 'Driver', 'Vehicle', 'Top 13 Time', 'Shoot-Out Time', 'Best Time of Day']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Grant Hohaia', 'Toyota Corolla', '1:15.45', '1:16.36', '1:15.45']
SQL:

assistant: SELECT COUNT("Vehicle") FROM "Table" WHERE "Top 13 Time" = '1:18.72';