Year	kt
1990	32217.9
1991	34291
1992	19998
1993	15754.1
1994	14819.2
1995	13745.8
1996	14239.8
1997	13924.1
1998	14706.6
1999	12247.2
2000	10515.9
2001	11155.5
2002	11223.2
2003	11232.7
2004	11915
2005	12829.2
2006	13019.7
2007	13209.6
2008	13066.4
2009	11692.1
2010	12603
2011	11845.6
2012	11925.8
2013	11331.1
2014	10862.9
2015	11067.4
2016	11203.1
2017	11222.2
2018	11652.5
2019	11735.8
2020	11693.8