Year	million passenger-km
1995	10344.505996047
1996	10696.252435836
1997	10976.875472385
1998	10950.918994143
1999	11164.803792244
2000	11552.161964256
2001	12149.624986664
2002	12005.65718487
2003	12021.773106727
2004	12087.046535813
2005	12062.893352373
2006	12590.874021192
2007	13212.731578192
2008	14276.384048686
2009	15004.14159834
2010	14992.79186061
2011	15275.793628
2012	15568.963881337
2013	15543.667841316
2014	15571.083308422
2015	16016.860652115
2016	16503.758569102
2017	17039.193726877
2018	18020.934471189
2019	18841.831667914
2020	15053.004083646
2021	9327.6307951394