Year	million ton-km
1970	5522.100189209
1971	5944.2998046875
1972	6716.3999938965
1973	7544.3001098633
1974	7775.6998901368
1975	7533.9000854493
1976	8005.9002075195
1977	8471.0001220704
1978	9015.3997802734
1979	9328.4996337891
1980	9304.0003662109
1981	9320.0003662109
1982	9042.3997802734
1983	10110.0999755859
1984	11260.299621582
1985	10662.0001831055
1986	11596
1987	13030.0001831055
1988	15046.1995849609
1989	15962.3000488281
1990	16176.7004394531
1991	15727.6002197266
1992	16867.2995605469
1993	17712.1999511719
1994	20562.4007568359
1995	21260.3004150391
1996	23457.400390625
1997	27435.30078125
1998	27563.6003417969
1999	29173.7991943359
2000	32068.089
2001	29634.381
2002	31132.711000000003
2003	35701.850999999995
2004	39106.7
2005	38884.463
2006	41385.079999999994
2007	42047.584
2008	40702.261
2009	36444.608654396005
2010	41310.58463635002
2011	41601.9135350454
2012	41071.3403776909
2013	39059.86451875035
2014	40309.51425194451
2015	39941.055393067
2016	40904.14613657467
2017	44432.536902023196
2018	45467.299596
2019	45607.30572044707
2020	43099.261011
2021	49244.645648