Year	million passenger-km
1995	12505
1996	11657
1997	12909
1998	13268
1999	16874
2000	17722
2001	15264
2002	14349
2003	13308
2004	13893
2005	13568
2006	9968
2007	9368
2008	8188
2009	7401
2010	7578
2011	7941
2012	8977
2013	8998
2014	7796
2015	7117
2016	6428
2017	6295
2018	6215.3
2019	6274.1
2020	3741.1
2021	4485.5