user: Question: Name the sum of year when start is less than 30
Columns: ['Year', 'Manufacturer', 'Start', 'Finish', 'Team']
Types: ['real', 'text', 'real', 'real', 'text']
Sample row: [2002.0, 'Chevrolet', 2.0, 36.0, 'Childress']
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Start" < 30.0;