Year	million ton-km
1970	2043.6000158787997
1971	2242.1000465156
1972	2607.8999850751
1973	3171.7999689578996
1974	3627.9999970198
1975	3602.6000248192
1976	4219.80004406
1977	4937.2000036241
1978	5371.7000672816
1979	5909.599978447
1980	6085.200067996999
1981	6351.999888420199
1982	6635.6000835896
1983	7520.899924039799
1984	8528.0000152589
1985	8943.2000412942
1986	9793.3998622895
1987	10795.600098609997
1988	11804.6001191141
1989	12764.9000549316
1990	13342.600190162699
1991	13067.6002326011
1992	13410.699879840004
1993	14224.1999934316
1994	16228.9997821153
1995	17771.299979217398
1996	18486.299779906898
1997	21415.699996068997
1998	20894.373809816603
1999	22225.3191853796
2000	25168.637
2001	24047.925999999996
2002	24512.742999999995
2003	25036.859
2004	27568.053
2005	28028.16599999999
2006	29273.066000000003
2007	30573.859999999993
2008	30005.916000000005
2009	33977.24
2010	28325.871104880644
2011	28747.531473159528
2012	27063.386880028025
2013	27505.098000224152
2014	27911.046481025627
2015	27730.098647157003
2016	28003.885164941767
2017	31279.54810354789
2018	31431.52027965179
2019	31156.157419471278
2020	26849.546412914347
2021	33883.971239724