Year	kt
1990	41068.6
1991	42767.7
1992	46774
1993	45792.8
1994	47302.9
1995	50693.2
1996	48742.5
1997	50931.6
1998	55600.6
1999	62207.6
2000	61661.2
2001	61383.6
2002	65604.9
2003	60523.6
2004	62128.8
2005	65473.8
2006	60448
2007	58797.6
2008	56844.4
2009	56299.6
2010	50937.3
2011	49867.9
2012	48220.3
2013	46555.2
2014	45931.1
2015	49851.9
2016	48695.2
2017	53272.7
2018	49461.2
2019	44564.7
2020	38973.5