Year	million ton-km
1970	15.3000001907
1971	17.3999996185
1972	17.7999992371
1973	13.8999996185
1974	17.1000003815
1975	20.7000007629
1976	20.7000007629
1977	23.7000007629
1978	24.7000007629
1979	28
1980	29.3999996185
1981	39
1982	53.5
1983	69.6999969482
1984	88.1999969482
1985	98.5
1986	111.5
1987	112
1988	118.8000030518
1989	138.1000061035
1990	144
1991	128.1999969482
1992	109.1999969482
1993	122.8000030518
1994	185.1999969482
1995	164.1000061035
1996	198
1997	208.6000061035
1998	255.1000061035
1999	269.5
2000	278.061
2001	239.036
2002	249.206
2003	238.885
2004	241.872
2005	286.954
2006	309.434
2007	206.828
2008	195.482
2009	180.31
2010	416.985098697369
2011	333.306675121003
2012	356.265453827017
2013	386.683474639046
2014	418.691607425321
2015	377.360014527
2016	374.357162291
2017	403.828739
2018	437.625328
2019	483.4138791
2020	438.908903264
2021	589.483009