Year	million passenger-km
1995	2133
1996	2476
1997	2437
1998	2542
1999	2721
2000	3200
2001	3697
2002	3426
2003	4041
2004	4376
2005	4558
2006	4334.9
2007	4659
2008	4492
2009	4138
2010	4378
2011	4571
2012	4558
2013	4548
2014	4252.58
2015	4233.88
2016	3416
2017	3657
2018	3542
2019	3185
2020	1516