Year	million ton-km
1970	519.6000018714
1971	567.6000010373
1972	687.4000032916
1973	791.8000188619999
1974	962.3000036254
1975	988.0999981539
1976	1100.2000081688
1977	1308.2999828609
1978	1442.799977675
1979	1446.4000091552998
1980	1588.099996209
1981	1721.0000198482003
1982	1844.5000236555995
1983	1716.5999800338002
1984	2013.0000313448002
1985	2102.1000283285
1986	2298.4000298156
1987	2423.2999933137003
1988	2360.9999765605003
1989	2622.4000050276004
1990	2746.3000172822
1991	2701.3999441711003
1992	3029.4000294951
1993	3267.4000590891
1994	3645.699985847
1995	3635.6000376792
1996	3556.7000812143992
1997	4611.1999711543995
1998	4739.0999917834
1999	4244.700076058601
2000	4669.84
2001	4226.78
2002	3967.612
2003	4070.9869999999996
2004	4690.433
2005	4566.581000000001
2006	4392.843
2007	4829.109
2008	5272.132
2009	6647.0599999999995
2010	5132.962957902706
2011	5076.129889545172
2012	5194.275650345623
2013	6050.697426398285
2014	5994.188982045473
2015	5806.759989100696
2016	5688.795698815031
2017	6056.981488583688
2018	6374.187704793859
2019	6283.616011522583
2020	5262.002892836
2021	5783.07554266