Year	million ton-km
1970	370.8999938965
1971	403.5
1972	433.3999938965
1973	484.200012207
1974	520.299987793
1975	534.299987793
1976	567.700012207
1977	550.4000244141
1978	608.5999755859
1979	670.4000244141
1980	688.5999755859
1981	713.0999755859
1982	746.5999755859
1983	825.5999755859
1984	967.200012207
1985	989.799987793
1986	977
1987	1006.799987793
1988	1170.5999755859
1989	1311.3000488281
1990	1385.3000488281
1991	1241.4000244141
1992	1249.6999511719
1993	1369.1999511719
1994	1478.5999755859
1995	1637.4000244141
1996	1781
1997	1956.5
1998	1805.6999511719
1999	1881.5999755859
2000	1896.114
2001	1709.813
2002	1578.027
2003	1496.297
2004	1656.579
2005	1526.819
2006	1503.185
2007	1429.8449999999998
2008	1388.665
2009	1346.938
2010	1957.32853635002
2011	1980
2012	1960
2013	1946.30559714895
2014	2084.318163
2015	2074.830881067
2016	2246.22709557467
2017	2840.9851350232
2018	2482
2019	3109.04305844707
2020	2306.166349
2021	3240