Year	kt
1990	192.8
1991	200.8
1992	227.2
1993	252.1
1994	278.3
1995	292.9
1996	313.1
1997	314
1998	345.4
1999	361.2
2000	366.8
2001	386.6
2002	373.3
2003	396.2
2004	416.9
2005	411.1
2006	431.6
2007	440
2008	444.9
2009	444.2
2010	507.7
2011	501.6
2012	507
2013	506.4
2014	505.9
2015	501.2
2016	505.5
2017	530.9
2018	527.9
2019	534.6
2020	499.2