CREATE TABLE table_203_838 (id DECIMAL, "year" DECIMAL, "world car of the year" TEXT, "world performance car" TEXT, "world green car" TEXT, "world car design of the year" TEXT)

what is the total number of cars entered for 2007 in the green car category ?
SELECT "world green car" FROM table_203_838 WHERE "year" = 2007
SELECT "world green car" FROM "table_203_838" WHERE "year" = 2007