Year	kt
1990	99830
1991	96217.8
1992	87748.6
1993	76209.4
1994	64645.6
1995	57507.8
1996	58453.6
1997	59020.5
1998	57201.9
1999	54957.9
2000	52967.5
2001	51720.2
2002	51752.9
2003	52525.9
2004	55753.4
2005	56464.6
2006	58794.1
2007	57326.9
2008	60231.7
2009	57177.3
2010	61443.7
2011	58325.8
2012	59738.3
2013	59891.2
2014	59431.8
2015	54871.3
2016	55201.4
2017	56247
2018	59271.6
2019	57681.2
2020	54801.5