Year	kt
1990	183.8
1991	169.8
1992	182.9
1993	173.1
1994	175.9
1995	201.7
1996	222.4
1997	230.1
1998	248.1
1999	295.6
2000	305.8
2001	358.5
2002	392
2003	419.1
2004	416
2005	451.5
2006	518.7
2007	460
2008	475.7
2009	510.6
2010	540.7
2011	566.8
2012	525.6
2013	502
2014	496.4
2015	499.9
2016	542.9
2017	584.7
2018	594.7
2019	617.2
2020	620.6