Year	kt
1990	66.9
1991	66.9
1992	63.7
1993	63.7
1994	63.6
1995	66.8
1996	85.6
1997	89
1998	82.8
1999	89.4
2000	89.3
2001	92.9
2002	82.9
2003	87
2004	61.7
2005	61.6
2006	61.6
2007	105
2008	101.1
2009	127.5
2010	127.1
2011	134.2
2012	120.5
2013	111.9
2014	158.9
2015	134.3
2016	151.3
2017	141
2018	177.5
2019	166.9
2020	121.3