SCHEMA:
CREATE TABLE table_13836704_4 (total_passengers_2008 INTEGER, change_2008_09 VARCHAR)
USER:
what being the maximum total passengers 2008 with change 2008/09 being 6.5%

QUERY:
SELECT MAX(total_passengers_2008) FROM table_13836704_4 WHERE change_2008_09 = "6.5%"