Year	million ton-km
1970	208.999999985
1971	236.99999986590004
1972	255.6000032725
1973	324.9999986587
1974	401.700008325
1975	417.1000043828
1976	465.20000384779996
1977	480.8000032977001
1978	556.5000079128
1979	654.3000016738
1980	706.0999998823002
1981	810.7999967039999
1982	846.5000111682999
1983	921.1999862046
1984	987.2999888213002
1985	984.4999906495001
1986	890.7000204773002
1987	974.9000098335999
1988	970.7999965175999
1989	954.1000031679998
1990	902.0000029950002
1991	857.9000060337999
1992	957.0000094996
1993	1055.4999935852
1994	1105.3000051826998
1995	1112.0999987794996
1996	1212.8999900293998
1997	1318.9999874532002
1998	1399.8999704048
1999	1639.6000164747998
2000	1691.7090000000003
2001	1662.2450000953675
2002	1471.6370000000002
2003	1621.5209999999997
2004	1798.283
2005	1816.41
2006	2217.8669999999997
2007	1906.7830000000006
2008	1765.4059999999997
2009	1789.4839999999997
2010	2101.9423787628084
2011	2183.8784779742587
2012	2552.693422393845
2013	2681.7891821703292
2014	2761.1204678692056
2015	2763.0182573577317
2016	2890.1278198198124
2017	3619.1080751927902
2018	3558.6572838067736
2019	3762.318588470809
2020	3316.6518091651647
2021	4293.841265182