Year	million ton-km
1970	36.7000007629
1971	42.4000015259
1972	54.2999992371
1973	67.5999984741
1974	67.5
1975	76.1999969482
1976	87.0999984741
1977	92.3000030518
1978	106.0999984741
1979	121.6999969482
1980	131.5
1981	137
1982	110.5999984741
1983	109.1999969482
1984	145.8000030518
1985	170
1986	155.1000061035
1987	169
1988	121.5
1989	114.4000015259
1990	143.1999969482
1991	162.6999969482
1992	158.8000030518
1993	150.8999938965
1994	225.1999969482
1995	155.8999938965
1996	168.8000030518
1997	227.1999969482
1998	284.799987793
1999	317
2000	309.858
2001	295.884
2002	341.598
2003	350.089
2004	394.925
2005	390.425
2006	456.958
2007	482.34
2008	482.78499999999997
2009	714.057
2010	908.948170756014
2011	774.603519631098
2012	763.886260561117
2013	677.139988908
2014	617.529552725
2015	714.003211
2016	760.849242
2017	928.83550977
2018	1062.987599
2019	1072.52473
2020	732.796479
2021	962.569234