Year	million ton-km
1970	14.1999998093
1971	17.6000003815
1972	19.8999996185
1973	27.7000007629
1974	41.2999992371
1975	42.9000015259
1976	43.5999984741
1977	52.0999984741
1978	58.9000015259
1979	79.8000030518
1980	121.9000015259
1981	156
1982	177.8999938965
1983	189
1984	169.8000030518
1985	153.1000061035
1986	222
1987	340.200012207
1988	455
1989	438.200012207
1990	458.6000061035
1991	475.5
1992	504.1000061035
1993	615.5
1994	733.700012207
1995	782.5999755859
1996	749.4000244141
1997	710
1998	429.3999938965
1999	362
2000	408.542
2001	408.372
2002	405.498
2003	424.362
2004	434.101
2005	439.773
2006	469.222
2007	484.52
2008	394.58299999999997
2009	276.918
2010	665.663628453711
2011	754.297938393013
2012	880.340263956616
2013	768.23502
2014	902.116486410853
2015	758.705163350469
2016	974.556289
2017	1052.36048
2018	1131.913455454
2019	981.74186
2020	674.799378544
2021	772.901013