CREATE TABLE table_204_791 (id DECIMAL, "event" TEXT, "winner" TEXT, "second" TEXT, "third" TEXT, "fourth" TEXT)

what is the total number of times chelsea williams was the winner between 2007 and 2010 ?
SELECT COUNT(*) FROM table_204_791 WHERE "winner" = 'chelsea wlliams'
SELECT COUNT(*) FROM "table_204_791" WHERE "winner" = 'chelsea wlliams'