Year	million ton-km
1970	21.7000007629
1971	31.6000003815
1972	36.9000015259
1973	46.7999992371
1974	67.5
1975	100.1999969482
1976	130.8000030518
1977	129.6999969482
1978	121.9000015259
1979	106.6999969482
1980	149.8000030518
1981	194.8999938965
1982	181.1000061035
1983	243.5
1984	244.5
1985	225.3999938965
1986	235.3000030518
1987	238.6000061035
1988	303.700012207
1989	327.3999938965
1990	316
1991	307.6000061035
1992	314.1000061035
1993	351.3999938965
1994	380.200012207
1995	373.5
1996	384.5
1997	471.6000061035
1998	184.8999938965
1999	240.8999938965
2000	289.946
2001	274.979
2002	275.053
2003	278.368
2004	300.637
2005	322.706
2006	318.85
2007	285.577
2008	277.362
2009	227.454
2010	460.194054824
2011	470.003413890059
2012	533.283614656041
2013	325.682352
2014	577.474932
2015	604.508812
2016	665.124567915
2017	753.351739
2018	835.904513
2019	926.888641
2020	360.409324
2021	530.283136