Year	million ton-km
1991	2
1992	11.1000003815
1993	21.7999992371
1994	25.3999996185
1995	27.2999992371
1996	28.7000007629
1997	35.2999992371
1999	36.7000007629
2000	76.007
2001	74.744
2002	21.059
2003	45.675
2004	56.479
2005	0
2006	0
2009	0
2010	0.484
2011	0.692604
2012	0.88838849653504
2013	0.677064
2014	34.36805
2015	30.302405
2016	21.084889
2017	22.206886
2018	26.293869
2019	6.900144
2020	1.636713284
2021	0.000290479