Year	million ton-km
1970	13.3999996185
1971	14.3999996185
1972	16.2999992371
1973	17
1974	18
1975	22.1000003815
1976	24.7000007629
1977	32
1978	38.5
1979	60.0999984741
1980	71.5999984741
1981	107.8000030518
1982	111.3000030518
1983	135.1999969482
1984	171
1985	164.3000030518
1986	222.6999969482
1987	244
1988	223.1000061035
1989	233.3999938965
1990	145
1991	116.1999969482
1992	209.3000030518
1993	254.1000061035
1994	283.799987793
1995	329.700012207
1996	333.799987793
1997	364.6000061035
1998	364.6000061035
1999	267.700012207
2000	243.091
2001	226.332
2002	254.302
2003	219.483
2004	226.93
2005	241.623
2006	239.207
2007	266.337
2008	279.74
2009	281.215
2010	335.099445284
2011	277.544065677216
2012	267.254
2013	245.968996
2014	267.877606
2015	216.335004
2016	223.005444
2017	309.864884
2018	392.363053
2019	364.649349
2020	119.717272
2021	200.1616