Year	kt
1990	126.3
1991	126.6
1992	120.6
1993	114.5
1994	111.4
1995	108.4
1996	102.1
1997	102.4
1998	99.5
1999	93.4
2000	88
2001	80.6
2002	78
2003	68.7
2004	64
2005	62.5
2006	44.1
2007	41.5
2008	42.3
2009	40.4
2010	42.7
2011	40.1
2012	42.1
2013	47.3
2014	50.6
2015	54.5
2016	52.7
2017	56
2018	54
2019	53.4
2020	41.4