Year	million ton-km
1970	145.70000068830004
1971	160.19999821480002
1972	164.59999977810003
1973	189.2000023051
1974	245.200002983
1975	263.7000007931
1976	296.10000106710004
1977	317.7000005395
1978	355.7999991105
1979	435.50000336060015
1980	441.0000011027
1981	466.6000015512001
1982	472.80000080159994
1983	435.6999998241
1984	473.59999467439997
1985	508.7000010534002
1986	463.8000062854001
1987	507.7000012921002
1988	488.1999927906999
1989	513.0000008196001
1990	480.4000028221
1991	401.7000051292
1992	408.69999930269995
1993	422.10000228150005
1994	481.29999791829994
1995	488.29999982540016
1996	496.1999954951
1997	504.2999965324001
1998	453.9999955296
1999	427.8999992312999
2000	402.3580000000001
2001	318.92900009536737
2010	664.2063852168081
2011	772.9139216644353
2012	981.1705138257065
2013	1105.3418159891867
2014	1205.6415728969937
2015	1409.5402234499368
2016	1656.109421488813
2017	2232.6206574540624
2018	2251.8704022730103
2019	2628.862082560929
2021	3889.374215814