Year	million ton-km
1970	69.5999984741
1971	63.4000015259
1972	52
1973	70.5999984741
1974	90.4000015259
1975	125.3000030518
1976	144.1000061035
1977	161.6000061035
1978	194.8000030518
1979	214.6999969482
1980	235.3999938965
1981	248.5
1982	224.1000061035
1983	230.1000061035
1984	270.6000061035
1985	309.799987793
1986	319.5
1987	327.8999938965
1988	388.799987793
1989	418.700012207
1990	420.5
1991	373.299987793
1992	398.6000061035
1993	408.3999938965
1994	441.5
1995	445.5
1996	427.200012207
1997	422.700012207
1998	402.3999938965
1999	331.799987793
2000	340.309
2001	371.228
2002	346.88
2003	346.607
2004	402.035
2005	407.926
2006	426.991
2007	313.872
2008	319.796
2009	303.905
2010	332.957297192
2011	297.683519787229
2012	286.075685790508
2013	292.760800570437
2014	204.623134285262
2015	183.17731267
2016	175.4744
2017	214.52857
2018	217.534134
2019	192.977927
2020	95.88035
2021	75.60493