CREATE TABLE table_15845 ("Order Year" CLOB, "Manufacturer" CLOB, "Model" CLOB, "Fleet Series  ( Quantity ) " CLOB, "Powertrain  ( Engine/Transmission ) " CLOB, "Fuel Propulsion" CLOB)

how many times is the fuel propulsion is cng?
SELECT COUNT("Fleet Series (Quantity)") FROM table_15845 WHERE "Fuel Propulsion" = 'CNG'
SELECT COUNT("Fleet Series (Quantity)") FROM "table_15845" WHERE "Fuel Propulsion" = 'CNG'