Year	million ton-km
1997	2325.3000488281
1998	4151.1000976563
1999	4545.7001953125
2000	5111.511
2001	5066.022
2002	5714.644
2003	5780.75
2004	6931.629
2005	7763.873
2006	8325.969
2007	10028.957
2008	8985.895
2009	13293.176
2010	10373.434773
2011	10053.898445
2012	9468.41800958361
2013	9396.48053
2014	10826.12281
2015	11294.272491
2016	11409.118758
2017	12415.19932
2018	12676.721747
2019	11739.489567
2020	8084.89962
2021	9027.879964