Year	million passenger-km
1995	6833
1996	6953
1997	7022
1998	7210
1999	7701
2000	8243
2001	8732
2002	8874
2003	8834
2004	8658
2005	8936
2006	9617
2007	10261
2008	11146
2009	11321
2010	11155
2011	11378
2012	11792
2013	11842
2014	12121
2015	12650
2016	12800
2017	13331
2018	13546.798247255
2019	14617.207234121
2020	8129
2021	8008