Year	kt
1990	148
1991	142
1992	151.5
1993	157.6
1994	160.7
1995	163.8
1996	167
1997	167
1998	227.4
1999	236.8
2000	243.2
2001	253
2002	249.8
2003	231
2004	226.2
2005	224.1
2006	234.3
2007	237.8
2008	171.4
2009	168.2
2010	174.8
2011	194.2
2012	197.2
2013	120.6
2014	130.4
2015	184.4
2016	206.4
2017	222.4
2018	229.1
2019	235.4
2020	236.6