Year	kt
1990	67421
1991	64552.2
1992	58001.9
1993	58382.4
1994	57784.3
1995	57431.3
1996	58454.9
1997	56990.1
1998	57353.3
1999	57910.5
2000	54633.3
2001	56280.4
2002	55599.9
2003	58186.9
2004	56349.8
2005	55921.2
2006	55457.5
2007	53850.4
2008	53014.2
2009	47839.1
2010	47880.5
2011	46907.3
2012	43427.2
2013	40762.6
2014	40625.2
2015	43384.1
2016	44248.4
2017	49449.8
2018	49202.9
2019	47261.8
2020	44769.3