Year	kt
1990	35621.6
1991	27418
1992	21771.8
1993	20152.3
1994	21719.4
1995	23175.5
1996	25203.4
1997	27448.2
1998	27112.5
1999	27998.5
2000	28353.1
2001	27465.1
2002	26423.5
2003	25628.6
2004	25364.8
2005	26317.9
2006	26780.2
2007	27677.5
2008	26747.1
2009	26979.6
2010	28110
2011	27586.3
2012	28690.9
2013	28869.7
2014	26677.1
2015	29209.8
2016	27176.4
2017	26241.3
2018	26674.6
2019	24418.5
2020	24327.8