Year	kt
1990	29305.4
1991	27325.3
1992	30197.9
1993	32428.6
1994	34412.4
1995	34389.2
1996	34597.1
1997	36543.5
1998	37887.5
1999	39702.4
2000	34283.1
2001	34735.2
2002	34381
2003	37186.8
2004	37354.8
2005	36366.4
2006	37210.6
2007	37760.1
2008	36872.8
2009	37439.3
2010	40116.4
2011	39071.3
2012	38770.1
2013	39627
2014	39643
2015	40288.8
2016	39578.4
2017	39174.9
2018	38571.5
2019	37661.6
2020	36177.4