Year	million passenger-km
1995	4869
1996	4503
1997	4563
1998	4602
1999	4380
2000	3834
2001	3899
2002	3926
2003	3585
2004	3633
2005	3753
2006	3876
2007	3987
2008	4213
2009	4152
2010	4111
2011	4143
2012	3803
2013	3649
2014	3852
2015	3957
2016	4146
2017	4391
2018	4487
2019	4964.014
2020	2552
2021	2912