Year	kt
1990	46.5
1991	46.5
1992	44.3
1993	44.9
1994	46.6
1995	47.5
1996	47.5
1997	47.5
1998	51
1999	51
2000	53.5
2001	53.5
2002	58.3
2003	65.9
2004	74.5
2005	80
2006	81.7
2007	81.8
2008	88.5
2009	93.8
2010	102.8
2011	100.5
2012	118.7
2013	121.3
2014	119.2
2015	123.6
2016	128.7
2017	134.4
2018	137.5
2019	140.2
2020	141.1