Year	kt
1990	53346.2
1991	54236.3
1992	56745.9
1993	56504.9
1994	58488.8
1995	58230.9
1996	63647.4
1997	57381.6
1998	58363.4
1999	57264.9
2000	53277.5
2001	52497.3
2002	54023.7
2003	55202.7
2004	53593.3
2005	50082.6
2006	48734.9
2007	47054.3
2008	46023.3
2009	42760.7
2010	47985.5
2011	44452
2012	41996.6
2013	40388.1
2014	38993
2015	39120.1
2016	38691.2
2017	38168.2
2018	35915.9
2019	34964.6
2020	33576.1