Year	kt
1990	6060.5
1991	4119.6
1992	2239.3
1993	2078.4
1994	2084.7
1995	1951.1
1996	1968
1997	1479.16
1998	1804.55
1999	2985.35
2000	3186.54
2001	3234.2
2002	3761.9
2003	4137.4
2004	4322.3
2005	4095.9
2006	4081.8
2007	4258.4
2008	4209.5
2009	4368.2
2010	4785.4
2011	5136.7
2012	4541.8
2013	4795.4
2014	5188
2015	4797
2016	4573.2
2017	5403.7
2018	5316.1
2019	4993.3
2020	4383.2