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)

how many total world performance cars are there for 2007 ?
SELECT "world performance car" FROM table_203_838 WHERE "year" = 2007
SELECT "world performance car" FROM "table_203_838" WHERE "year" = 2007