Year	million ton-km
1970	35.7999992371
1971	41.5
1972	48.7000007629
1973	68.5999984741
1974	110.3000030518
1975	114.5
1976	136.6999969482
1977	140.6999969482
1978	164
1979	176.3000030518
1980	185.8999938965
1981	199.6000061035
1982	221.3999938965
1983	262.8999938965
1984	288.3999938965
1985	305.3999938965
1986	318.6000061035
1987	335.3999938965
1988	320.299987793
1989	317.3999938965
1990	325.1000061035
1991	379.8999938965
1992	409.8999938965
1993	473
1994	555.5999755859
1995	580.299987793
1996	745
1997	928.4000244141
1998	826.200012207
1999	855.5999755859
2000	817.137
2001	762.982
2002	687.521
2003	800.524
2004	748.833
2005	781.469
2006	819
2007	868.14
2008	920.847
2009	799.295
2010	468.638
2011	892.848
2012	975.021
2013	934.540524
2014	999.3047112
2015	1155.45872005615
2016	1231.85419306685
2017	1335.95320545677
2018	1349.29523130803
2019	1207.88220494
2020	773.953135823
2021	317.589119892521