Year	million ton-km
1970	1.2000000477
1971	2.5999999046
1972	4.6999998093
1973	5.4000000954
1974	7.1999998093
1975	13.1999998093
1976	24.5
1977	40.0999984741
1978	51
1979	67
1980	80.1999969482
1981	111.9000015259
1982	129.5
1983	119.3000030518
1984	139.8999938965
1985	151.8000030518
1986	164.6999969482
1987	186.3000030518
1988	201.5
1989	206
1990	222.8000030518
1991	161.5
1992	175.5
1993	213.5
1994	219.6000061035
1995	265.200012207
1996	296.6000061035
1997	271
1998	219.1999969482
1999	193.6000061035
2000	204.022
2001	177.79
2002	197.317
2003	190.326
2004	253.845
2005	223.582
2006	258.557
2007	276.656
2008	140.846
2009	163.192
2010	201.985
2011	196.184547
2012	188.06493
2013	172.126
2014	171.97
2015	169.105
2016	144.211200649
2017	158.95506
2018	175.8386
2019	153.56892
2020	74.66289
2021	103.32204