Year	kt
1990	34544.9
1991	31869.2
1992	23010.6
1993	18332.1
1994	18685.7
1995	16498.1
1996	17480
1997	17858.5
1998	16427.8
1999	15487.3
2000	14932.5
2001	15231.7
2002	14795.1
2003	16682
2004	16755
2005	16807.7
2006	16090
2007	19765.8
2008	17481.5
2009	14047.9
2010	18500.4
2011	18502.6
2012	16989
2013	18846.5
2014	17594.9
2015	14377.1
2016	15907.2
2017	16773.5
2018	15716.9
2019	10060.7
2020	7097.52