Year	kt
1990	6642.3
1991	8498.5
1992	9130
1993	8552.3
1994	9339.6
1995	10531.7
1996	10799.1
1997	11640.7
1998	12455.4
1999	14059
2000	15030.5
2001	16065.3
2002	16093.7
2003	18699.7
2004	19628.8
2005	21105.6
2006	21918.5
2007	23270.2
2008	24216.2
2009	26568.7
2010	25431.9
2011	22950.1
2012	21012.5
2013	27825
2014	27429.9
2015	13552.2
2016	10035.2
2017	9682.2
2018	11349.8
2019	11194.8
2020	9960.1