Year	kt
1990	13152.4
1991	13045.1
1992	13145.2
1993	10722.4
1994	8792.5
1995	8618.6
1996	9194.8
1997	9690.5
1998	9923.9
1999	9899.8
2000	10204.5
2001	11619.6
2002	12674.7
2003	15446.9
2004	16096
2005	17580
2006	20054.6
2007	20485.8
2008	20012.1
2009	19030.2
2010	21443
2011	22243
2012	21497.2
2013	22186.3
2014	22014.2
2015	21310.6
2016	18291.6
2017	18224.7
2018	17763.7
2019	17195.3
2020	15420