Year	million ton-km
1974	1137.3000092283999
1975	1261.6999971420998
1976	1429.7000234650004
1977	1601.8999822439
1978	1904.099987641
1979	1987.4000050797997
1980	2206.2000040186003
1981	2529.9000257328
1982	2810.9000364394005
1983	2936.6999703495003
1984	3477.300048217501
1985	3672.4000288993
1986	4035.6000352651
1987	4477.000009730399
1988	4701.999978594401
1989	4796.2000365332
1990	5245.8000193609
1991	5677.1999344303
1992	6512.700086749801
1993	7141.100075222698
1994	8043.699885815302
1995	8403.0000663625
1996	8755.900003544899
1997	10340.600096277902
1998	10431.299900323198
1999	11284.899917870602
2000	12795.627
2001	12670.638000000004
2002	13643.564999999997
2003	14839.106999999998
2004	17342.999999999996
2005	17900.553000000004
2006	18421.929999999997
2007	22197.147000000008
2008	22210.637000000002
2009	24646.529
2010	29695.17610749749
2011	29287.792439981407
2012	28333.936323898863
2013	29836.52428525714
2014	32276.876046920646
2015	33907.82408138055
2016	35204.78586432393
2017	39599.28240379615
2018	42883.723490178985
2019	44645.59913299882
2020	34483.029121185
2021	40727.836208785004