Year	kt
1990	3932
1991	4034.7
1992	4834.9
1993	5118
1994	5445.4
1995	6369.1
1996	6202
1997	6566.3
1998	8305.3
1999	8218.5
2000	9443.3
2001	9840
2002	10494.3
2003	10568.6
2004	10780.4
2005	11557.6
2006	11550.1
2007	12442.2
2008	11272.3
2009	11884.4
2010	11477.6
2011	11774.9
2012	12183.7
2013	13046.3
2014	13998.5
2015	16455.9
2016	17451.9
2017	16530.1
2018	18075.7
2019	19017.8
2020	16865.2