Year	million passenger-km
1995	11713
1996	11890
1997	12051
1998	12148
1999	12501
2000	12620
2001	13301
2002	14147
2003	14509
2004	14914
2005	16144
2006	16578
2007	17434
2008	17776
2009	18571
2010	19177
2011	19471
2012	19262
2013	19447
2014	20010
2015	20389
2016	20812
2017	20864.5
2018	20613
2019	21737
2020	13334
2021	14308