Year	million ton-km
1974	1984.9999930412
1975	2262.6999936851
1976	2665.2000201272003
1977	2956.1999815404997
1978	3253.399995342
1979	3410.6000349297997
1980	3793.8999789131008
1981	4209.8000072611985
1982	4456.600031428101
1983	4793.299960665199
1984	5331.300051145599
1985	5184.4000373706
1986	5494.3000453039995
1987	6307.2000330017
1988	6764.599993385401
1989	7087.400001637702
1990	7463.200055561901
1991	7662.799940638001
1992	8566.700072042102
1993	10117.300084047296
1994	11432.899896115005
1995	11988.600106038299
1996	12366.7999902439
1997	14292.2000462115
1998	14142.873841004797
1999	15001.118944573596
2000	16911.859
2001	16509.922000000002
2002	17520.666
2003	18837.049
2004	21915.981000000003
2005	22669.605000000003
2006	23640.412999999997
2007	27013.36400000001
2008	28361.424000000003
2009	30565.417999999998
2010	38092.178537452055
2011	38037.04682958571
2012	37453.607569681626
2013	39170.383351451725
2014	42159.85524229054
2015	43809.034988542044
2016	46419.937251416384
2017	52267.82454892383
2018	56371.83604562186
2019	57488.73645740963
2020	42913.275690109
2021	51245.293754745006