Year	million passenger-km
1995	4178
1996	4294
1997	3784
1998	3948
1999	7003
2000	9935
2001	10037
2002	10022
2003	8726
2004	9195
2005	10781.4466761865
2007	12834.865789096
2010	15741.095930305
2011	16571.896814
2015	16016.860652115
2017	10789