Year	million ton-km
1974	2032.5999963059996
1975	2358.1999953392997
1976	2762.5000304136
1977	3007.999989182001
1978	3376.3000014202
1979	3623.6000311970984
1980	3944.899975232599
1981	4396.200006931899
1982	4695.1000336558
1983	5119.399960055599
1984	5762.4000518475
1985	5698.600032262599
1986	5943.100052237799
1987	6780.900026820602
1988	7280.699979804301
1989	7439.500023029704
1990	7772.7000606207
1991	7977.399938285299
1992	8766.000089160403
1993	9379.7000533045
1994	10788.099879190298
1995	11345.200106203896
1996	11698.000015824795
1997	13439.500123232598
1998	13181.599874086802
1999	14037.199913754994
2000	15797.028999999995
2001	15515.474999999999
2002	16340.548999999992
2003	17601.755000000005
2004	20603.410999999996
2005	21328.393
2006	22010.284999999996
2007	25621.979000000003
2008	25766.818
2009	28020.892999999996
2010	34384.51087325806
2011	33914.06318516637
2012	32980.922012242576
2013	34625.41867869091
2014	37262.79853040955
2015	38587.68178703724
2016	40059.695313800905
2017	45238.13932635696
2018	49309.91997483431
2019	50726.961868862505
2020	37636.00324959566
2021	44751.950782980006