Year	million ton-km
1970	175.7000013888
1971	176.2000029386
1972	187.9000061154
1973	252.799998641
1974	254.2999986409
1975	356.5000062958
1976	421.0000029355
1977	472.29999966919996
1978	522.8000152856
1979	554.3000033497001
1980	654.8999937177
1981	729.1999920906001
1982	715.0999981463999
1983	772.6000107825
1984	953.6000021994
1985	963.800000906
1986	999.8000158072
1987	1119.4000020027
1988	1209.9999761581
1989	1280.7999877929
1990	1266.9000253678
1991	1098.7999916076
1992	1042.6000013351
1993	957.8999891281999
1994	1304.099983409
1995	1453.4000267983001
1996	1324.7000150679
1997	1384.3000102043002
1998	1275.8999853134999
1999	1220.6000027656
2000	1375.5159999999998
2001	1289.953
2002	1273.614
2003	1345.932
2004	1610.556
2005	1683.0229999999997
2006	1793.273
2007	1722.1580000000001
2008	1976.9189999999999
2009	1824.8169999999998
2010	2582.2999387731875
2011	2640.9730235069765
2012	2545.939130117064
2013	2727.845796570437
2014	2688.2029044252617
2015	2499.721684016626
2016	2567.848507411751
2017	3116.1558330873
2018	3447.4089046280124
2019	2720.1018375799176
2020	1351.631846449
2021	1511.1788614309999