CREATE TABLE table_56013 ("Agent" TEXT, "Melting / boiling point" TEXT, "Effectiveness as blood agent" FLOAT, "Persistence ,  open area" FLOAT, "Persistence ,  enclosed area" FLOAT, "Field stability" FLOAT, "Storage stability" FLOAT, "Toxicity as blood agent" FLOAT)

What is the field stability of Cyanogen Bromide that has an effectiveness of 9?
SELECT COUNT("Field stability") FROM table_56013 WHERE "Agent" = 'cyanogen bromide' AND "Effectiveness as blood agent" > '9'
SELECT COUNT("Field stability") FROM "table_56013" WHERE "Agent" = 'cyanogen bromide' AND "Effectiveness as blood agent" > '9'