CREATE TABLE table_49079 ("Outcome" TEXT, "Year" FLOAT, "Pro Slam Championship" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What is the average Year, when Outcome is 'Winner'?
SELECT AVG("Year") FROM table_49079 WHERE "Outcome" = 'winner'
SELECT AVG("Year") FROM "table_49079" WHERE "Outcome" = 'winner'