Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_21636599_2 (security_forces VARCHAR, period VARCHAR)
### Question:
How many figures are named for security forces in 1998?
### Answer:
SELECT COUNT(security_forces) FROM table_21636599_2 WHERE period = 1998