Year	million ton-km
1970	631.6000028623001
1971	709.7000127513002
1972	772.5000058785
1973	965.1999991908998
1974	1106.5000048651998
1975	1247.4000030387997
1976	1478.2000133917
1977	1784.4000100495
1978	2008.3000282273
1979	2162.300001271
1980	2526.0999895333
1981	2892.799993269099
1982	2979.2000170722004
1983	3291.0000049246
1984	3873.4999620695003
1985	3926.399986841
1986	4062.8000486120995
1987	4509.5000638217
1988	4814.300016566899
1989	5065.200000300901
1990	5118.3000122381
1991	4746.599976144501
1992	5148.700016811102
1993	5498.499933593102
1994	6385.700020938799
1995	6615.200090654301
1996	6603.3000547217
1997	7061.200073950099
1998	6515.499982885899
1999	6758.200074165901
2000	6946.396000000002
2001	6645.035999999997
2002	6888.411000000002
2003	7341.227999999999
2004	7997.5790000000015
2005	7525.127
2006	8063.393
2007	7803.411000000003
2008	7711.138000000002
2009	9211.525000000001
2010	10943.953421654682
2011	11551.581153093588
2012	12402.724192649446
2013	12791.781047140228
2014	13271.768743682893
2015	12668.692722274995
2016	13940.654651793582
2017	17221.324022734003
2018	19057.044512702945
2019	20155.297952413137
2020	15458.046879592997
2021	19991.845046023787