Year	million ton-km
1970	143.1000061035
1971	196.8000030518
1972	269.1000061035
1973	391.700012207
1974	418.799987793
1975	470.8999938965
1976	573
1977	540.200012207
1978	510.3999938965
1979	589.9000244141
1980	530.5999755859
1981	465.8999938965
1982	461.8999938965
1983	610.0999755859
1984	487.700012207
1985	199.8000030518
1986	33.0999984741
1987	194.8000030518
1988	309.200012207
1989	283.5
1990	167.1000061035
1991	169.6000061035
1992	152.6999969482
1993	125.1999969482
1994	138.3999938965
1995	128.6999969482
1996	80.0999984741
1997	123.5
1998	108.4000015259
1999	102.5999984741
2000	85.204
2001	74.837
2002	80.767
2003	75.056
2004	84.899
2005	86.61
2006	73.556
2007	81.743
2008	66.621
2009	93.983
2010	48.272
2011	47.699
2012	50.619
2013	70.098
2014	59.58
2015	54.077
2016	45.558
2017	53.387
2018	56.569
2019	51.70094
2020	19.11662
2021	22.23564