Year	million ton-km
1970	376.8999938965
1971	408.3999938965
1972	461
1973	498.5
1974	609
1975	586.700012207
1976	631.9000244141
1977	719.4000244141
1978	786.9000244141
1979	869.5
1980	947.0999755859
1981	1046.4000244141
1982	1032.5
1983	1193.6999511719
1984	1392.5
1985	1403.9000244141
1986	1509.4000244141
1987	1734.3000488281
1988	1881.8000488281
1989	2002.9000244141
1990	2129.1000976563
1991	2224.3000488281
1992	2396.8999023438
1993	2770.6999511719
1994	3203.8000488281
1995	3742.1999511719
1996	3902.3999023438
1997	3893.1000976563
1998	3833.3999023438
1999	4053
2000	4367.344
2001	4115.852
2002	4203.584
2003	4330.731
2004	4780.432
2005	4893.971
2006	4959.004
2007	5005.596
2008	4903.379
2009	4520.328
2010	6444.38161844899
2011	6347.25316032084
2012	6014.58854749604
2013	5753.728484
2014	5726.179652
2015	5292.794684592
2016	4745.958515461
2017	5855.480475616
2018	5886.51490365179
2019	5656.442
2020	4145.02216
2021	4346.39907