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_88 (earnings__ INTEGER, money_list_rank VARCHAR, year VARCHAR)

### Question ###
What is the average amount of earnings for years under 2004 and money list rankings of 6?

### Accurate SQL ###

SELECT AVG(earnings__) AS $_ FROM table_name_88 WHERE money_list_rank = "6" AND year < 2004