Year	million ton-km
1970	379.6000061035
1971	464.1000061035
1972	585.0999755859
1973	753.0999755859
1974	739.4000244141
1975	852.9000244141
1976	1030.8000488281
1977	1147.5
1978	1356.0999755859
1979	1624.8000488281
1980	1870.6999511719
1981	2111.5
1982	2221.8999023438
1983	2528
1984	2796.3000488281
1985	3071.3999023438
1986	3608.1000976563
1987	4326.2998046875
1988	4780.7001953125
1989	5128.6000976563
1990	5068.7998046875
1991	5225.2998046875
1992	5185.2001953125
1993	5484.2001953125
1994	6007.8999023438
1995	6538
1996	6801.2998046875
1997	7504.6000976563
1998	7514.1000976563
1999	8225.599609375
2000	8672.048
2001	7614.102
2002	8204.671
2003	8279.576
2004	8708.244
2005	8549.241
2006	8480.024
2007	8435.069
2008	8172.807
2009	10485.665
2010	7698.79769790059
2011	6545.945
2012	7045.781
2013	7715.927
2014	8661.758
2015	8661.758
2016	9360.888
2017	10684.574
2018	9420.659
2019	8919.48
2020	7841.508
2021	10947.023