CREATE TABLE table_23050383_1 (kei VARCHAR2, economic_incentive_regime VARCHAR2)

How many KEI catagories are listed when the economic incentive regime is 2.56?
SELECT COUNT(kei) FROM table_23050383_1 WHERE economic_incentive_regime = "2.56"
SELECT COUNT("kei") FROM "table_23050383_1" WHERE "2.56" = "economic_incentive_regime"