Year	kt
1990	156.7
1991	159.6
1992	225.1
1993	202.6
1994	204.6
1995	261.4
1996	281.6
1997	338.3
1998	311
1999	429.9
2000	462.2
2001	481.3
2002	614.4
2003	528.5
2004	693.1
2005	626.9
2006	790.5
2007	810.6
2008	870.6
2009	916.6
2010	963
2011	1012.8
2012	1144.6
2013	1128.5
2014	1355.2
2015	1339.3
2016	1465.9
2017	1546.1
2018	1776.1
2019	1999.5
2020	1454