Year	million ton-km
1970	21.2999992371
1971	23.7999992371
1972	24.6000003815
1973	29.7000007629
1974	29.7999992371
1975	28.6000003815
1976	30.1000003815
1977	35.5
1978	38.0999984741
1979	41.7999992371
1980	48
1981	51.7000007629
1982	61
1983	70.5
1984	72.3000030518
1985	76.8000030518
1986	85.9000015259
1987	90.1999969482
1988	100.0999984741
1989	129.3999938965
1990	135.1000061035
1991	128.1000061035
1992	113.1999969482
1993	157.1000061035
1994	190.8999938965
1995	211.5
1996	236.8000030518
1997	294
1998	276
1999	251.8999938965
2000	280.735
2001	171.092
2002	215.579
2003	255.699
2004	325.203
2005	353.576
2006	408.775
2007	489.674
2008	542.623
2009	484.365
2010	728.823996721215
2011	740.085265
2012	690.866320824715
2013	660.802462
2014	667.07538
2015	713.484
2016	761.85394
2017	852.01263
2018	957.63859
2019	1067.31511
2020	480.37919
2021	750.28925