Year	kt
1990	10407.9
1991	10867.9
1992	11173.7
1993	10260.5
1994	9565
1995	8634.5
1996	8331.2
1997	9186.3
1998	8728.6
1999	8285.2
2000	8108.1
2001	7812.9
2002	8339.5
2003	8878.7
2004	9382.4
2005	9883
2006	10714.9
2007	11907.5
2008	12734.2
2009	13570.4
2010	14702.2
2011	15991.7
2012	16961
2013	18123.9
2014	19478.3
2015	20002.9
2016	21328.7
2017	21628.2
2018	21881.2
2019	21828.8
2020	18375.3