Year	million ton-km
1970	96.3000030518
1971	108.4000015259
1972	131.1000061035
1973	176.5
1974	144.6999969482
1975	211.3000030518
1976	250.6999969482
1977	275.8999938965
1978	297.700012207
1979	297.6000061035
1980	366
1981	411.3999938965
1982	409.8999938965
1983	461.6000061035
1984	545.5
1985	489.700012207
1986	539.700012207
1987	645.200012207
1988	646.299987793
1989	680.5999755859
1990	662.9000244141
1991	493.1000061035
1992	429.3999938965
1993	372.3999938965
1994	563.5999755859
1995	653.9000244141
1996	565
1997	528
1998	531.299987793
1999	531.200012207
2000	547.652
2001	515.37
2002	546.34
2003	579.85
2004	708.475
2005	774.04
2006	842.55
2007	967.684
2008	1233.937
2009	1235.158
2010	1630.96414222155
2011	1702.702702
2012	1579.229879
2013	1733.76172
2014	1851.32674
2015	1833.847614
2016	1893.8815
2017	2407.098107
2018	2703.96417383
2019	1938.232596
2020	875.122843
2021	907.929041