CREATE TABLE table_53499 ("Year" FLOAT, "Ceremony" CLOB, "Category" CLOB, "Nominee" CLOB, "Result" CLOB)

What year was there a category of Best Supporting Actress?
SELECT SUM("Year") FROM table_53499 WHERE "Category" = 'best supporting actress'
SELECT SUM("Year") FROM "table_53499" WHERE "Category" = 'best supporting actress'