CREATE TABLE table_59190 ("Location" CLOB, "Year" FLOAT, "Champion" CLOB, "Runner-up" CLOB, "Score" CLOB)

What year weas John McEnroe the champion?
SELECT AVG("Year") FROM table_59190 WHERE "Champion" = 'john mcenroe'
SELECT AVG("Year") FROM "table_59190" WHERE "Champion" = 'john mcenroe'