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_1963459_2 ( year INTEGER, average_speed__mph_ VARCHAR )

### Question ###
What year was the average speed 145.24

### Accurate SQL ###

SELECT MAX(year) FROM table_1963459_2 WHERE average_speed__mph_ = "145.24"