CREATE TABLE table_19790 ("Year" FLOAT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

How many mixed doubles were won in 1996?
SELECT COUNT("Mixed doubles") FROM table_19790 WHERE "Year" = '1996'
SELECT COUNT("Mixed doubles") FROM "table_19790" WHERE "Year" = '1996'