Year	million ton-km
1970	9.3000001907
1971	38.2999992371
1972	18.6000003815
1973	28.7000007629
1974	58.7999992371
1975	101.6999969482
1976	122.3000030518
1977	104.6999969482
1978	134.3999938965
1979	176
1980	238.6000061035
1981	268.200012207
1982	306.700012207
1983	327.6000061035
1984	399.200012207
1985	419.5
1986	464.5
1987	491.8999938965
1988	588
1989	612.700012207
1990	661
1991	866.200012207
1992	925.9000244141
1993	1060.3000488281
1994	1236.6999511719
1995	1307.9000244141
1996	1348.1999511719
1997	1628.3000488281
1998	1522.1999511719
1999	1670.5999755859
2000	1712.88
2001	1669.242
2002	1823.591
2003	1764.122
2004	1868.578
2005	2002.424
2006	2106.87
2007	2454.554
2008	2288.961
2009	2132.553
2010	2938.670391666
2011	2870.78888291064
2012	2758.43883609572
2013	2640.367634
2014	2524.64667
2015	2136.72847939514
2016	2160.069653102
2017	2511.891367964
2018	2666.263256
2019	2327.667095
2020	684.208676
2021	604.020922