what are the number of times astm d 638 is listed as the test method ?
CREATE TABLE table_204_229 (
    id number,
    "property" text,
    "test method" text,
    "units" text,
    "4275" text,
    "4301" text,
    "4435" text,
    "4630" text,
    "4645" text
)
SELECT COUNT(*) FROM table_204_229 WHERE "test method" = 'astm d 638'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what are the number of times astm d 638 is listed as the test method ? ### Input: CREATE TABLE table_204_229 (
    id number,
    "property" text,
    "test method" text,
    "units" text,
    "4275" text,
    "4301" text,
    "4435" text,
    "4630" text,
    "4645" text
) ### Response: SELECT COUNT(*) FROM table_204_229 WHERE "test method" = 'astm d 638'