Year	million passenger-km
1995	6757
1996	6788
1997	6980
1998	7097
1999	7354
2000	7755
2001	8036
2002	8260
2003	8265
2004	8676
2005	9150
2006	9607
2007	9932
2008	10406
2009	10427
2010	10403
2011	11003
2012	10857
2013	10595
2014	10974
2015	10333
2016	10025
2017	10167
2018	10500
2019	10849
2020	7397
2021	6970