user: ### NOW ANSWER:
Question: How many Antonov An-2 Colt aircraft are in service?
Columns: ['Aircraft', 'Origin', 'Type', 'Versions', 'In service']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Antonov An-2 Colt', 'Soviet Union', 'Transport', 'An-2', 1.0]
SQL:

assistant: SELECT AVG("In service") FROM "Table" WHERE "Aircraft" = 'Antonov An-2 Colt';