Year	million passenger-km
1995	9625
1996	9689
1997	8140
1998	7971
1999	7995
2000	8206
2001	8240
2002	8300
2003	8249
2004	8295
2005	8470
2006	9296
2007	9580
2008	10837
2009	10653
2010	10737
2011	10875
2012	11323
2013	11915
2014	12092
2015	12208
2016	12578
2017	12656.7
2018	13204.7
2019	13350
2020	7417.005
2021	8433.154238