Year	kt
1990	24
1991	24.7
1992	25.2
1993	29
1994	27.3
1995	30.1
1996	34.6
1997	32.9
1998	31.4
1999	32.1
2000	35.5
2001	34.7
2002	43.7
2003	46.5
2004	50.8
2005	61.8
2006	68.3
2007	58.2
2008	64
2009	58.6
2010	54.3
2011	54.2
2012	57.7
2013	63.8
2014	60.1
2015	60.7
2016	56.7
2017	72.7
2018	73.2
2019	73.6
2020	56.9