Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_16549 ( "Engine" text, "Power, continuous" text, "Critical altitude This is the highest altitude at which the engine can achieve its full continuous power rating. Above this altitude, power falls off with height as with a naturally aspirated engine . See Supercharger#Altitude effects for details." text, "Power, takeoff" text, "Compression ratio" text, "Supercharger gear ratio" text, "Octane rating" text, "Dry weight" text )

### Question ###
What is the compression ratio when the continuous power is hp (KW) at 2,200 RPM and the critical altitude is at sea level?

### Accurate SQL ###

SELECT COUNT("Compression ratio") FROM table_16549 WHERE "Power, continuous" = 'hp (kW) at 2,200 RPM' AND "Critical altitude This is the highest altitude at which the engine can achieve its full continuous power rating. Above this altitude, power falls off with height as with a naturally aspirated engine . See Supercharger#Altitude effects for details." = 'sea level'