Year	million passenger-km
2005	8640.7627436806
2006	9052.390462155
2007	8715.4385913024
2008	9237.510554638
2009	9108.0603687135
2010	8817.8723669107
2011	7287.9333902597
2012	6002.5177929744
2013	5035.0018230423
2014	5733.5770156506
2015	6883.5652307941
2016	8065.3684635781
2017	8360.7820221858