Year	million ton-km
1974	222.5999995471
1975	326.3999952376
1976	386.00000622880003
1977	400.59999228270004
1978	495.7000001446
1979	566.3999968543001
1980	754.2000140698001
1981	918.9000025912999
1982	1005.5000125541999
1983	1153.4000123291999
1984	1327.2000212223002
1985	1417.6000002920998
1986	1666.8999909462
1987	2084.1000059172
1988	2482.3000118285
1989	2502.5000059155996
1990	2853.3000062479
1991	3418.6999936103
1992	3882.4000484943003
1993	4316.9000316857
1994	4952.9999045132
1995	5281.900047421501
1996	5774.899929761999
1997	6477.0001021996995
1998	6134.699864223599
1999	7217.899845913
2000	8421.981
2001	8616.309
2002	9706.447999999999
2003	10564.329999999998
2004	12560.167000000001
2005	13282.482
2006	13535.942
2007	17476.883
2008	17222.174
2009	17878.735
2010	24370.742337043677
2011	23669.577948002643
2012	22335.522973282226
2013	22575.74763005395
2014	24615.008355335012
2015	25835.122891796935
2016	26849.893395555697
2017	29710.726839392548
2018	32180.076007806354
2019	32193.382045895578
2020	22432.088905544002
2021	24731.254516659996