Year	million ton-km
1970	208.999999985
1971	236.9999998659
1972	255.6000032725
1973	324.9999986587
1974	401.70000832499994
1975	417.1000043828001
1976	465.2000038478
1977	480.8000032977001
1978	556.5000079128001
1979	654.3000016738
1980	706.0999998823
1981	810.7999967040004
1982	846.5000111683001
1983	921.1999862046
1984	987.5999888332001
1985	984.8999906555001
1986	892.2000204773
1987	976.6000098813
1988	972.7999965176001
1989	958.6000031679998
1990	912.4000026135001
1991	867.0000064152999
1992	971.9000091180999
1993	1066.0999939667001
1994	1115.8000051827
1995	1124.8999989702
1996	1229.5999907922999
1997	1343.1999882161003
1998	1416.9999707862999
1999	1659.3000172377
2000	1711.592
2001	1684.2540000953675
2002	1499.872
2003	1642.8690000000001
2004	1822.4060000000002
2005	1842.2220000000002
2006	2248.583
2007	1934.4270000000004
2008	1792.1149999999998
2009	1815.107
2010	2138.2313787628086
2011	2215.8004779742587
2012	2559.1714223938457
2013	2708.0351741703294
2014	2793.4314638692053
2015	2782.2532493577323
2016	2910.2508198198125
2017	3648.453075192791
2018	3566.4502838067733
2019	3764.7262784708096
2020	3317.4093691651647
2021	4294.639025182