Year	kt
1990	30532.1
1991	24599.5
1992	20322.2
1993	17414.1
1994	14138.2
1995	12141.5
1996	10402.7
1997	9580.4
1998	8649.1
1999	7352.4
2000	6709.6
2001	7017.8
2002	7182.4
2003	7765.4
2004	7775.9
2005	8175.6
2006	7975.1
2007	8139.2
2008	8150
2009	7638.1
2010	8295.1
2011	8344.5
2012	8137.3
2013	7181.5
2014	7712.2
2015	8020.6
2016	8143
2017	8064
2018	8555.9
2019	8921.6
2020	8611.2