CREATE TABLE table_64966 ("Year" FLOAT, "Game" TEXT, "Genre" TEXT, "Platform ( s ) " TEXT, "Developer ( s ) " TEXT)

What is the sum number of year when Call of Duty 4: Modern Warfare was the game?
SELECT COUNT("Year") FROM table_64966 WHERE "Game" = 'call of duty 4: modern warfare'
SELECT COUNT("Year") FROM "table_64966" WHERE "Game" = 'call of duty 4: modern warfare'