Year	million ton-km
1973	158.3000026642
1974	209.30000286519999
1975	230.20000048010002
1976	276.20000168710004
1977	282.10000034430004
1978	298.6000006275001
1979	388.5000028986001
1980	375.20000169450003
1981	395.0000020491001
1982	395.099999018
1983	400.4999992922
1984	425.2999944464001
1985	478.00000414250013
1986	466.7000079826
1987	522.6999986845
1988	536.9999938532
1989	589.0999969616
1990	531.4000039696
1991	499.90000608570006
1992	479.4999971092
1993	423.00000032800006
1994	611.4000049753001
1995	582.4999983234999
1996	562.0999955906
1997	633.4999989643001
1998	519.2000007332
1999	541.3000050487
2000	584.58
2001	491.4910000953675
2002	439.17600000000004
2003	473.576
2004	532.763
2005	568.549
2006	631.6550000000001
2007	496.666
2008	536.944
2009	626.8689999999999
2010	850.8707747320544
2011	968.715583721015
2012	1198.8140642813944
2013	1396.9073637497138
2014	1476.0818793199167
2015	1511.2321650468564
2016	1754.5416100017505
2017	2357.2887635565603
2018	2379.832347619068
2019	2843.7925363907543
2020	3173.7162314101643
2021	4016.917568493999