Year	million ton-km
1984	0.3000000119
1985	0.400000006
1986	1.5
1987	1.7000000477
1988	2
1989	4.5
1990	10.3999996185
1991	9.1000003815
1992	14.8999996185
1993	10.6000003815
1994	10.5
1995	12.8000001907
1996	16.7000007629
1997	24.2000007629
1998	17.1000003815
1999	19.7000007629
2000	19.883
2001	22.009
2002	28.235
2003	21.348
2004	24.123
2005	25.812
2006	30.716
2007	27.644
2008	26.709
2009	25.623
2010	36.289
2011	31.922
2012	6.478
2013	26.245992
2014	32.310996
2015	19.234992
2016	20.123
2017	29.345
2018	7.793
2019	2.40769
2020	0.75756
2021	0.79776