Year	million ton-km
1970	484.5
1971	532.9000244141
1972	656.5999755859
1973	826.799987793
1974	941
1975	920.700012207
1976	1040.5
1977	1204.1999511719
1978	1344.8000488281
1979	1513.5
1980	1506
1981	1495.1999511719
1982	1592.0999755859
1983	1941
1984	2235.5
1985	2378.5
1986	2826.8999023438
1987	3247.6999511719
1988	3470
1989	3840.3000488281
1990	3994.1999511719
1991	4108.7001953125
1992	4287.5
1993	4639.8999023438
1994	5373.2998046875
1995	5835.8999023438
1996	6036.2998046875
1997	6183.8999023438
1998	6233.7998046875
1999	6610.7001953125
2000	7127.713
2001	7026.248
2002	7195.804
2003	7295.67
2004	8065.6
2005	7722.133
2006	8133.987
2007	8528.959
2008	8352.882
2009	10187.719
2010	7487.48100076523
2011	7716.76190298526
2012	7236.98063027006
2013	7335.69940204315
2014	7184.14620802563
2015	6986.405444999
2016	6942.706331998
2017	7901.65234423
2018	7969.86364
2019	7763.61921423928
2020	9166.3712826
2021	11533.04853603