Year	million ton-km
1970	31.1000003815
1971	32.4000015259
1972	42.2000007629
1973	53.9000015259
1974	47.7999992371
1975	32.5
1976	52.7999992371
1977	52.9000015259
1978	54.9000015259
1979	62.0999984741
1980	61.4000015259
1981	67.5999984741
1982	58.2000007629
1983	65.5999984741
1984	68.5999984741
1985	103.0999984741
1986	91.6999969482
1987	104.3000030518
1988	101.9000015259
1989	103.0999984741
1990	112.6999969482
1991	114.1999969482
1992	107
1993	127
1994	135
1995	117
1996	118.6999969482
1997	129.1000061035
1998	112.5999984741
1999	103.4000015259
2000	129.804
2001	96.944
2002	80.854
2003	62.748
2004	58.245
2005	64.075
2006	70.649
2007	72.242
2008	78.109
2009	31.396
2010	4.85169832333462
2011	4.18568526670255
2012	2.31403046797287
2013	0.593232
2014	19.359432
2015	26.10771098
2016	23.993
2017	23.525
2018	21.909
2019	23.90576
2020	10.09844
2021	12.4593