Year	kt
1990	6564.2
1991	6674.5
1992	6877.3
1993	9269.7
1994	11298.23
1995	12719.48
1996	15442.4
1997	16154.9
1998	16767.9
1999	17613.22
2000	16204.16
2001	15955.9
2002	15689.5
2003	16764.8
2004	17453.6
2005	15811.2
2006	16558.6
2007	16966.4
2008	19275.3
2009	21145
2010	22801.5
2011	23865.8
2012	23868
2013	26958.7
2014	29610.5
2015	31648.9
2016	29520.7
2017	25064.8
2018	23637.4
2019	24382.9
2020	19814.5