Year	million ton-km
1974	1698.100014806
1975	2060.5000318587
1976	2437.5000825226007
1977	2708.9999892785995
1978	3379.0999756827996
1979	4124.3000365272
1980	4709.5999347718
1981	5348.300033085102
1982	5812.0998721496
1983	6584.700006321101
1984	7531.5001005679005
1985	7906.0998601021
1986	9023.0000824036
1987	10622.0998168513
1988	11930.500243857497
1989	13090.6002199202
1990	13594.399767733898
1991	14609.3998165129
1992	16374.700091123601
1993	18872.2001811265
1994	21147.7995885609
1995	23599.1997421981
1996	25932.19958639161
1997	31943.400323547594
1998	32666.400097683192
1999	36237.6995224505
2000	38573.524999999994
2001	36488.609
2002	40720.42800000001
2003	40567.062000000005
2004	46352.98400000001
2005	48131.619999999995
2006	49776.649
2007	56456.284
2008	53813.636000000006
2009	67952.87599999999
2010	73279.54052562737
2011	71129.55913315214
2012	61896.595543862495
2013	60230.744384053934
2014	64344.0425670436
2015	66620.2655819429
2016	68376.17397221585
2017	72869.4626689043
2018	76282.13644014578
2019	73216.73097712814
2020	55974.689204367
2021	65329.56447995252