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_71816 ( "Date" text, "Opponent" text, "Score" text, "Loss" text, "Attendance" real, "Record" text )

### Question ###
What was the average attendance when the New York Mets were opponents with a record of 51-33?

### Accurate SQL ###

SELECT AVG("Attendance") FROM table_71816 WHERE "Opponent" = 'new york mets' AND "Record" = '51-33'