Year	million ton-km
1970	164.1000061035
1971	180.1999969482
1972	254.3000030518
1973	316.700012207
1974	407.1000061035
1975	460.5
1976	471.6000061035
1977	499.299987793
1978	571.299987793
1979	570.5
1980	588.200012207
1981	644.9000244141
1982	734.700012207
1983	692.0999755859
1984	831.700012207
1985	909.200012207
1986	1014.4000244141
1987	1013.700012207
1988	975.799987793
1989	1147.9000244141
1990	1082
1991	1005.299987793
1992	1143.3000488281
1993	1284.3000488281
1994	1468.5
1995	1581.9000244141
1996	1644.8000488281
1997	1789.9000244141
1998	1642.8000488281
1999	1462.9000244141
2000	1727.901
2001	1467.445
2002	1539.738
2003	1478.37
2004	1499.485
2005	1530.675
2006	1412.26
2007	1477.828
2008	1807.062
2009	1782.3
2010	1302.474647875
2011	1294.49545
2012	1363.447091
2013	1637.382
2014	1596.774
2015	1493.939
2016	1513.832873341
2017	1736.549227
2018	1845.64776
2019	1521.14944
2020	1209.70683
2021	1294.48671