Year	million ton-km
1970	9.3999996185
1971	9.1999998093
1972	8.5
1973	17
1974	19
1975	15.6999998093
1976	17.8999996185
1977	14.1999998093
1978	22.1000003815
1979	18.5
1980	18
1981	19.1000003815
1982	23.3999996185
1983	30.2999992371
1984	31.5
1985	30.3999996185
1986	39.2999992371
1987	54.2999992371
1988	55.2000007629
1989	47.7000007629
1990	52.2000007629
1991	39.2000007629
1992	51
1993	56.0999984741
1994	57.2000007629
1995	52.7999992371
1996	47.7999992371
1997	50.7999992371
1998	53.9000015259
1999	65.5999984741
2000	77.045
2001	92.732
2002	118.382
2003	141.539
2004	193.459
2005	253.163
2006	301.219
2007	298.083
2008	295.183
2009	271.562
2010	279.990902805
2011	191.160655418998
2012	234.568543129171
2013	258.081012
2014	248.56658
2015	233.104791944
2016	257.576935754
2017	275.512276845
2018	295.047760350297
2019	320.952554616571
2020	113.06282
2021	299.58742