Year	kt
1990	194.5
1991	198.1
1992	198.1
1993	207.2
1994	207.2
1995	216.9
1996	219.9
1997	229.3
1998	244.9
1999	259.9
2000	244.8
2001	308.6
2002	296.2
2003	296.2
2004	314.6
2005	329.5
2006	357.2
2007	409
2008	427.7
2009	484.9
2010	434.2
2011	446.9
2012	452.9
2013	430.6
2014	506.8
2015	585.9
2016	593.2
2017	602.3
2018	597.8
2019	606.9
2020	611.4