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_204_156 ( id number, "year" number, "crystal bicycle\n(best professional cyclist)" text, "best young rider" text, "best manager" text, "crystal drop of sweat\n(best helper)" text )

### Question ###
what is the average number of times johan museeuw starred ?

### Accurate SQL ###

SELECT COUNT(*) FROM table_204_156 WHERE "crystal bicycle\n(best professional cyclist)" = 'johan museeuw'