Year	million ton-km
1970	2239.9000151159
1971	2444.500046134
1972	2845.4999845028
1973	3424.7999713421004
1974	3908.8000000716
1975	3870.3000203368993
1976	4523.0000457767
1977	5273.4000034334
1978	5740.5000731944
1979	6271.4999799729
1980	6432.400069713601
1981	6705.499891281201
1982	6969.9000866415
1983	7841.3999240398
1984	8868.2000122072
1985	9283.800042152498
1986	10137.6998596192
1987	11127.9000959397
1988	12151.5001187325
1989	13146.100059509397
1990	13748.600199699402
1991	13458.300224304
1992	13806.5998699218
1993	14663.599994957596
1994	16699.399787456
1995	18264.899975784097
1996	19068.3997821956
1997	22106.0000105649
1998	21585.6738319418
1999	22885.819190148002
2000	25835.768999999997
2001	24634.249000000003
2002	25092.520000000004
2003	25603.637
2004	28148.217000000004
2005	28167.901999999995
2006	29420.617
2007	30725.412000000004
2008	30132.465
2009	34070.615
2010	28906.37206668278
2011	29312.917247027483
2012	27690.344414566633
2013	28221.65990300415
2014	28755.72753960564
2015	28471.856739033
2016	28880.72462558828
2017	32295.700213547883
2018	32723.319649651785
2019	32487.002631186802
2020	27300.756548005287
2021	34449.730445731