Year	million ton-km
1970	9.1000003815
1971	9.1000003815
1972	10.3999996185
1973	12.3999996185
1974	10.3000001907
1975	13.6000003815
1976	12.3999996185
1977	9.3999996185
1978	10.3999996185
1979	11.6000003815
1980	10.3999996185
1981	12.3000001907
1982	12.6999998093
1983	15.8000001907
1984	15.5
1985	17.1000003815
1986	22
1987	25.5
1988	27.7999992371
1989	22
1990	19
1991	18
1992	22.2000007629
1993	23.7999992371
1994	29.7999992371
1995	33.2000007629
1996	44.4000015259
1997	56.2000007629
1998	73.1999969482
1999	62.7000007629
2000	49.294
2001	54.26
2002	40.22
2003	40.577
2004	31.942
2005	30.879
2006	30.15
2007	30.616999999999997
2008	31.692
2009	26.785
2010	0
2011	18.4269139282398
2012	17.175734601839
2013	16.930008
2014	17.313204
2015	20.9196451071138
2016	26.0034145040302
2017	47.76014
2018	17.76123
2019	13.708525
2020	13.421754
2021	22.318242