CREATE TABLE table_24520 ("Period" FLOAT, "Civilians" CLOB, "Security forces" CLOB, "Insurgents" CLOB, "Total per period" FLOAT)

How many figures are named for security forces in 1998?
SELECT COUNT("Security forces") FROM table_24520 WHERE "Period" = '1998'
SELECT COUNT("Security forces") FROM "table_24520" WHERE "Period" = '1998'