Year	million ton-km
1970	436.4000087750001
1971	520.4000054675
1972	612.9000133650001
1973	830.2000096812999
1974	895.2999870776
1975	1096.4999981972
1976	1332.8000069486
1977	1406.1000069381
1978	1472.2000137792
1979	1636.2000261173
1980	1738.6999712139996
1981	1866.2999811991
1982	1884.1999972164003
1983	2182.6999897061
1984	2285.10000363
1985	2026.2000033632999
1986	1907.5000169726998
1987	2303.9000170902
1988	2578.7000012099
1989	2643.2999864965
1990	2526.9000412597998
1991	2300.2000038549995
1992	2253.3000024106
1993	2238.5999780818
1994	2744.3999933749997
1995	2942.2000398413993
1996	2942.1000122799005
1997	3098.9000269546996
1998	2750.2999737635996
1999	2752.2999958844007
2000	3001.402
2001	2844.8369999999995
2002	2696.984
2003	2762.6480000000006
2004	3260.410999999999
2005	3427.840000000001
2006	3588.3550000000005
2007	3424.832000000001
2008	3556.1810000000005
2009	3374.3639999999996
2010	4689.33476576059
2011	4626.270745184958
2012	4646.98568834371
2013	4788.894393433764
2014	4985.9224834889355
2015	4679.8577056566955
2016	4854.909449476981
2017	5638.856922560821
2018	6426.196484655323
2019	6081.362735863682
2020	3152.9741284106394
2021	4024.1145741949995