user: Question: What is the total of win percentages when the year is 2008 and the crew is Varsity 8+?
Columns: ['Year', 'Coach', 'Crew', 'Record', 'Win %']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['2003', 'John Gartin', 'Varsity 8+', '7-3', 0.7]
SQL:

assistant: SELECT SUM("Win %") FROM "Table" WHERE "Year" = '2008' AND "Crew" = 'Varsity 8+';