Year	million ton-km
1995	1946
1996	2541
1997	2700.5
1998	2775.5
1999	3043.5
2000	2247
2001	4481
2002	3894
2003	4057
2004	4037
2005	3482
2006	4390
2007	6928
2008	7395.2
2009	7592
2010	6696.75
2011	6949.9
2012	8212
2014	8132
2015	7242
2016	6860.5
2017	6505