Year	million ton-km
1970	404.500005245
1971	435.29999822390005
1972	548.0000023842
1973	652.8000146150999
1974	798.6000047922
1975	832.0999953748001
1976	918.9000133276002
1977	1054.5999861958003
1978	1208.0999774932002
1979	1221.7000085115997
1980	1269.7999957797997
1981	1396.7000225781003
1982	1543.1000208854998
1983	1480.3999741075
1984	1784.5000314713996
1985	1883.4000328779
1986	2032.8000309467
1987	2085.2999979256
1988	1970.2999763487999
1989	2089.6000123024
1990	2191.0000176428
1991	2115.5999533532995
1992	2298.8000360128995
1993	2468.2000491619997
1994	2730.5999813079998
1995	2707.5000123977998
1996	2585.6000719070994
1997	3393.5000209809
1998	3367.0000413954
1999	2950.4000506402
2000	3238.65
2001	2813.73
2002	2765.0279999999993
2003	2859.1459999999997
2004	3514.2019999999993
2005	3420.508
2006	3275.897
2007	3444.4940000000006
2008	3869.441
2009	5391.634
2010	3641.1140738592776
2011	3559.7368402420166
2012	3562.283135248483
2013	4340.08433529617
2014	4258.031806297142
2015	4244.933690970566
2016	4095.4489013150314
2017	4732.527721027855
2018	5041.5024985838945
2019	4908.614207
2020	3694.732316836
2021	4290.0228446599995