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_name_66 ( year INTEGER, points VARCHAR, wins VARCHAR, class VARCHAR )

### Question ###
What is the mean year number where there are more than 0 wins, the class is 250cc, and the points are 95?

### Accurate SQL ###

SELECT AVG(year) FROM table_name_66 WHERE wins > 0 AND class = "250cc" AND points = 95