Year	million ton-km
1970	474.6000061035
1971	487.700012207
1972	619
1973	757.5999755859
1974	871.299987793
1975	995.299987793
1976	1278.9000244141
1977	1557.4000244141
1978	1697
1979	1912.1999511719
1980	1985.8000488281
1981	2128.3999023438
1982	2186.1000976563
1983	2483.6999511719
1984	2797.6999511719
1985	2873.3000488281
1986	3079.5
1987	3385.6000976563
1988	3681.6000976563
1989	3819.3000488281
1990	3995.8000488281
1991	3778.8000488281
1992	3840.5
1993	3717.1000976563
1994	4385.8999023438
1995	4577.7001953125
1996	4842.6000976563
1997	5132
1998	4773.6000976563
1999	4968.3999023438
2000	5224.34
2001	4825.202
2002	5030.16
2003	5067.323
2004	5584.213
2005	5802.442
2006	6135.028
2007	6424.966
2008	6187.795999999999
2009	6624.89
2010	5079.71814764909
2011	5068.76226392762
2012	4626.15380961188
2013	4327.126
2014	4151.293
2015	4098.31
2016	4155.407
2017	4260.597
2018	4443.789
2019	4522.586
2020	2467.943
2021	4107.03