Year	kt
1990	114.9
1991	121.8
1992	125.5
1993	129.3
1994	138.9
1995	149.4
1996	173
1997	183.2
1998	198
1999	205.2
2000	198.6
2001	207.2
2002	210.5
2003	223.2
2004	216.8
2005	228
2006	235.9
2007	250.8
2008	261.5
2009	262.4
2010	273.6
2011	260.3
2012	278.6
2013	317.1
2014	253.5
2015	272.6
2016	277.4
2017	287.5
2018	320.3
2019	346.2
2020	324.5