Year	million ton-km
1970	87.5000003427
1971	93.09999854859998
1972	99.19999932500001
1973	111.7000020668
1974	149.2000021262
1975	169.300000042
1976	194.60000108190002
1977	184.80000108480002
1978	198.1999990122
1979	230.50000096140002
1980	243.20000101630004
1981	270.0000018852
1982	272.6999996453
1983	252.89999796459998
1984	265.79999740420004
1985	294.7000014335
1986	295.8000050931
1987	338.20000188820006
1988	333.8999952227
1989	368.5999995023
1990	340.1000016479
1991	270.3000038415
1992	289.39999917160003
1993	277.8000009583001
1994	328.2000000401
1995	306.99999587959996
1996	307.79999855890003
1997	332.29999659210006
1998	279.99999728800003
1999	295.60000079869997
2000	291.177
2001	248.27300009536742
2010	632.154487305
2011	747.4241394561088
2012	962.6674319392881
2013	992.492088
2014	1101.6961566735297
2015	1307.7273099998677
2016	1559.3575617140998
2017	2131.0225604777997
2018	2156.4270141564057
2019	2508.8848182963625
2021	3785.7830334089995