user: Question: Name the number of year for June 30
Columns: ['Year', 'Date', 'Driver', 'Manufacturer', 'Laps', 'Miles (km)', 'Race Time', 'Average Speed (mph)']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: [1988.0, 'July 2', 'Rob Moroso', 'Oldsmobile', 200.0, '107.6 (173.165)', '1:36:04', '66.971']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Date" = 'June 30';