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_18047346_4 (_percentage_chg_2009_10 VARCHAR, passengers VARCHAR)

### Question ###
If the amount of passengers is 15,505,566, what is the %/chg. for 2009/10?

### Accurate SQL ###

SELECT _percentage_chg_2009_10 FROM table_18047346_4 WHERE passengers = "15,505,566"