Year	million ton-km
2010	3833.633027
2011	4118.699224
2012	4089.738747
2013	3981.463012
2014	4103.932874
2015	4085.724617
2016	4076.755917
2017	3760.2204401392
2018	3816.070253512
2019	3079.8397523271
2020	3585.4572606123