Year	million ton-km
1970	74.6999969482
1971	81.5999984741
1972	86.3000030518
1973	104.4000015259
1974	120
1975	121.9000015259
1976	149.6000061035
1977	171.8999938965
1978	206.3999938965
1979	183.1000061035
1980	147.3999938965
1981	204
1982	307.200012207
1983	292.5
1984	381.200012207
1985	375.700012207
1986	391.6000061035
1987	398.299987793
1988	403.299987793
1989	395.299987793
1990	463.700012207
1991	526.0999755859
1992	527.799987793
1993	492.1000061035
1994	565.799987793
1995	498.3999938965
1996	311.200012207
1997	812
1998	790.200012207
1999	636.9000244141
2000	600.616
2001	610.878
2002	538.757
2003	645.778
2004	1113.899
2005	1092.492
2006	1051.293
2007	1070.4489999999998
2008	1099.545
2009	2419.933
2010	954.66013894833
2011	968.160358466796
2012	918.324091591658
2013	1222.15686718904
2014	1315.40395631937
2015	1316.795809466
2016	1142.854709203
2017	1273.568638
2018	1350.008974
2019	1547.674684
2020	1496.604491452
2021	1605.222381