Year	million ton-km
1974	222.5999995471
1975	326.3999952376
1976	386.00000622880003
1977	402.2999923304
1978	497.50000009689995
1979	568.3999968543001
1980	756.4000141175
1981	920.8000025675
1982	1007.4000125303999
1983	1155.8000124246
1984	1329.6000213176999
1985	1420.0000003874998
1986	1669.4999908508
1987	2086.8000059649003
1988	2485.2000119239
1989	2505.5000059155996
1990	2856.4000061525
1991	3421.7999935149
1992	3885.5000483989
1993	4320.000031590301
1994	4956.0999044178
1995	5285.200047373801
1996	5778.199929714299
1997	6480.900102295101
1998	6136.1998642236
1999	7219.4998459368
2000	8423.739
2001	8617.874
2002	9708.185
2003	10566.153999999999
2004	12562.301000000001
2005	13284.68
2006	13538.228000000003
2007	17479.306000000004
2008	17224.466
2009	17877.874
2010	24366.018284533464
2011	23662.5245211281
2012	22329.8703227537
2013	22571.516766053945
2014	24608.080673213946
2015	25827.61741749294
2016	26840.4050450967
2017	29703.03834880355
2018	32170.218985806358
2019	32192.142336895584
2020	22429.372355544005
2021	24727.944487059995