Table schema:
CREATE TABLE table_name_78 (win__percentage INTEGER, year VARCHAR, coach VARCHAR, crew VARCHAR)

Question: What is the total number of win % when John Gartin is coach, the crew is varsity 8+, and the year is 2005?
SQL: SELECT SUM(win__percentage) FROM table_name_78 WHERE coach = "john gartin" AND crew = "varsity 8+" AND year = "2005"