Year	kt
1990	2871.2
1991	3061.6
1992	4148.5
1993	4180.9
1994	4850.5
1995	4809.8
1996	4526.9
1997	4493.9
1998	5015.3
1999	5034
2000	4946.8
2001	5422.7
2002	5523.2
2003	5798.9
2004	5943.6
2005	6273.9
2006	6557
2007	7602.5
2008	7515.3
2009	7198.5
2010	7105.5
2011	7430.8
2012	7446.7
2013	7778.7
2014	7832.3
2015	7537.9
2016	8008.9
2017	8173.5
2018	8166.6
2019	7956.4
2020	6967.4