Year	million ton-km
1974	29.2000007629
1975	46.2000007629
1976	49
1977	60
1978	86
1979	123
1980	120.9000015259
1981	155.3999938965
1982	184.1999969482
1983	216
1984	302
1985	403
1986	467.5
1987	647.5
1988	731.799987793
1989	683.0999755859
1990	818.299987793
1991	1009.5
1992	1316
1993	1547
1994	1717.1999511719
1995	1501
1996	1688.5999755859
1997	2083.6000976563
1998	2474.1999511719
1999	3295.3999023438
2000	3900.08
2001	4232.312
2002	5013.505
2003	5650.63
2004	7024.25
2005	7579.401
2006	7692.205
2007	11189.538
2008	11386.055
2009	11976.438
2010	17193.8774
2011	16764.869
2012	15568.753
2013	16053.7331
2014	17822.581
2015	19805.63
2016	21304.5851
2017	23323.6147
2018	25256.2071
2019	25394.5878
2020	19264.2436
2021	20961.2116