Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT _percentage_chg_2009_10 FROM table_18047346_4 WHERE passengers = "15,505,566"