Year	kt
1990	9934
1991	9781.2
1992	11925.3
1993	12203.8
1994	12994.3
1995	13604.1
1996	13868.3
1997	14373.6
1998	14616
1999	14630.8
2000	16268.1
2001	16250.9
2002	16873.5
2003	17309.8
2004	18580.9
2005	19869
2006	20167
2007	21090.3
2008	20009
2009	20665
2010	20196.8
2011	20756.3
2012	24123.3
2013	23803.7
2014	25553.1
2015	25309.1
2016	24730
2017	26021.8
2018	24710
2019	23147.9
2020	20974.1