CREATE TABLE table_203_424 (id DECIMAL, "year" DECIMAL, "starts" DECIMAL, "wins" DECIMAL, "top 5" DECIMAL, "top 10" DECIMAL, "poles" DECIMAL, "avg. start" DECIMAL, "avg. finish" DECIMAL, "winnings" TEXT, "position" TEXT, "team ( s ) " TEXT)

how many times was his average finish below 18 ?
SELECT COUNT(*) FROM table_203_424 WHERE "avg. finish" < 18
SELECT COUNT(*) FROM "table_203_424" WHERE "avg. finish" < 18