Year	million ton-km
1970	169.1000061035
1971	181.8999938965
1972	198.1999969482
1973	236.6000061035
1974	272.200012207
1975	285.799987793
1976	320.8999938965
1977	350.8999938965
1978	402.5
1979	407
1980	421.5
1981	453.299987793
1982	461.299987793
1983	540
1984	633.5999755859
1985	636.799987793
1986	673.9000244141
1987	734
1988	813.5
1989	888.700012207
1990	928.5
1991	944.799987793
1992	1063.5999755859
1993	1247.3000488281
1994	1408.4000244141
1995	1509.5
1996	1511.3000488281
1997	1829.6999511719
1998	1963.4000244141
1999	1877.3000488281
2000	1971.647
2001	1641.819
2002	1028.307
2003	1248.302
2004	1089.934
2005	1109.641
2006	1039.027
2007	1104.843
2008	1181.567
2009	1057.893
2010	1282.496418
2011	1354.590823
2012	1371.470116
2013	1444.374258
2014	1508.892548
2015	1409.329209
2016	1532.761243
2017	1581.35236
2018	1841.314
2019	1640.735
2020	842.992
2021	1230.786090909