Year	kt
1990	23965.6
1991	21441
1992	15966.67
1993	13403.99
1994	3162.67
1995	3369.47
1996	4188.03
1997	8493
1998	10760.7
1999	10516.1
2000	13955.1
2001	13763.7
2002	14556
2003	14871.4
2004	15571.7
2005	16225.4
2006	17910.2
2007	18888.5
2008	20761.2
2009	20589.7
2010	20842.5
2011	23738.2
2012	21960.2
2013	21847.8
2014	19506.8
2015	19629
2016	22356.6
2017	22692.7
2018	22615.8
2019	21124.3
2020	20946.8