Year	kt
1990	22310.7
1991	22629.7
1992	24380
1993	23960.3
1994	24225.9
1995	24325.8
1996	25412.8
1997	27689
1998	27180.8
1999	28612.9
2000	29455
2001	31618.8
2002	31543.1
2003	33397.6
2004	32836.1
2005	34232.2
2006	34265.9
2007	33270.5
2008	34165.4
2009	31169.7
2010	31049.3
2011	30290.6
2012	32107.4
2013	31885.5
2014	31970.7
2015	32281.2
2016	31185.7
2017	32927.4
2018	32409
2019	34008.2
2020	31359.7