CREATE TABLE table_204_229 (id DECIMAL, "property" TEXT, "test method" TEXT, "units" TEXT, "4275" TEXT, "4301" TEXT, "4435" TEXT, "4630" TEXT, "4645" TEXT)

what are the number of times astm d 638 is listed as the test method ?
SELECT COUNT(*) FROM table_204_229 WHERE "test method" = 'astm d 638'
SELECT COUNT(*) FROM "table_204_229" WHERE "test method" = 'astm d 638'