Year	kt
1990	153.2
1991	175.2
1992	176.2
1993	188.3
1994	207.4
1995	203.9
1996	238.7
1997	277.9
1998	294.2
1999	308.3
2000	293.7
2001	323.7
2002	352.3
2003	342.4
2004	383.2
2005	381.9
2006	389
2007	404.5
2008	417.6
2009	448.3
2010	443.7
2011	408.2
2012	423.7
2013	412.2
2014	456.7
2015	499.8
2016	565.6
2017	570.7
2018	602.3
2019	595.3
2020	598.7