Year	million ton-km
1970	199.3000061659
1971	271.0000023394
1972	355.1000046060001
1973	492.9000113532
1974	556.5999877976
1975	654.7999929489
1976	838.3000017253999
1977	885.1000145079
1978	929.6999979392999
1979	1108.200023301
1980	1143.299975231
1981	1221.7000034599998
1982	1373.6999977231999
1983	1626.6999707819004
1984	1638.2999939022993
1985	1387.7000086381997
1986	1307.7000053522
1987	1569.8000195623
1988	1748.3000231386002
1989	1923.0000172630998
1990	1753.5999885575
1991	1562.2000008596
1992	1970.6000163554002
1993	2225.6999805568994
1994	2637.0999706387
1995	2924.4000729621007
1996	2919.9999778868
1997	3156.5000599027003
1998	3255.2000129819
1999	3685.1999729274
2000	4069.469
2001	3977.352
2002	4574.3150000000005
2003	5348.805
2004	6842.743
2005	7614.616
2006	8798.176000000001
2007	10073.09
2008	13176.420999999998
2009	14557.538000000002
2010	15792.094559764226
2011	17136.927451638443
2012	19711.764619519297
2013	22234.013637266784
2014	24698.89969242636
2015	25918.457903304847
2016	27869.695020351894
2017	30342.725075828097
2018	31869.18038962169
2019	31621.850524247904
2020	27266.178097892
2021	33656.084224516795