Year	million passenger-km
1995	16594
1996	16800
1997	17878
1998	18869
1999	19655
2000	20144
2001	20828
2002	21211
2003	21127
2004	20386
2005	21624
2006	22105
2007	21857
2008	23969
2009	23137
2010	22456
2011	22795
2012	22476
2013	23788
2014	25072
2015	26142
2016	26670
2017	27487
2018	28434
2019	28835
2020	11998.51
2021	17002