Year	million ton-km
1970	516.9000244141
1971	564.9000244141
1972	714.0999755859
1973	843.9000244141
1974	847.299987793
1975	797.700012207
1976	866.4000244141
1977	984.0999755859
1978	1153.1999511719
1979	1263.9000244141
1980	1428.4000244141
1981	1579
1982	1511.4000244141
1983	1729.8000488281
1984	2193.3999023438
1985	2299.1000976563
1986	2547.3000488281
1987	2862.5
1988	3134.3000488281
1989	3447.1999511719
1990	3825.3999023438
1991	4023.3999023438
1992	4639.2001953125
1993	5405
1994	6405.2001953125
1995	6830.6000976563
1996	7618.1000976563
1997	6450.6000976563
1998	4663.5
1999	4925.2001953125
2000	5160.872
2001	4548.547
2002	4940.527
2003	5159.695
2004	5698.49
2005	5998.434
2006	6215.321
2007	6154.451
2008	6283.830999999999
2009	6615.125
2010	6082.73941307418
2011	6280.25098328964
2012	6243.54285285133
2013	6031.574712
2014	5974.825151208
2015	5423.17313862741
2016	5512.672996428
2017	5915.641
2018	6198.37
2019	5851.19
2020	3667.467
2021	4097.09