Year	kt
1990	152.9
1991	160
1992	168.3
1993	177.3
1994	190
1995	196.9
1996	206
1997	213.4
1998	220.5
1999	228.1
2000	235.4
2001	245.8
2002	257.6
2003	268.9
2004	286.3
2005	294.7
2006	304
2007	313.7
2008	323.2
2009	333.5
2010	342.8
2011	355.9
2012	355.6
2013	389
2014	340.7
2015	304.1
2016	298.1
2017	295
2018	300.9
2019	304.8
2020	223.3