What is the total number of win % when John Gartin is coach, the crew is varsity 8+, and the year is 2005?
CREATE TABLE "season_by_season_results" (
  "year" text,
  "coach" text,
  "crew" text,
  "record" text,
  "win_pct" real
);
SELECT SUM("win_pct") FROM "season_by_season_results" WHERE "coach"='john gartin' AND "crew"='varsity 8+' AND "year"='2005';