Year	kt
1990	51978
1991	62700.3
1992	56970.3
1993	59301.1
1994	63171.5
1995	60038.4
1996	73375.1
1997	63617.3
1998	59710.3
1999	56728.5
2000	52602
2001	54245.4
2002	53839.7
2003	59234
2004	53727.6
2005	50201.9
2006	58134
2007	53411.4
2008	50127.7
2009	47933.6
2010	48124.8
2011	43098
2012	38216.2
2013	39960.7
2014	35820
2015	33704.9
2016	35340.3
2017	33184
2018	33133.3
2019	29696.5
2020	27356.5