user: Question: How many Years have Ratings of 10.9/23?
Columns: ['Year', 'Network', 'Lap-by-lap', 's Color commentator', 'Pre-Race Host', 'Ratings']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2001.0, 'Fox', 'Mike Joy', 'Darrell Waltrip Larry McReynolds', 'Chris Myers', '10.0/24']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Ratings" = '10.9/23';