Year	kt
1990	2310.7
1991	2333.1
1992	1517.2
1993	1941.3
1994	2261.4
1995	2574.7
1996	2870.5
1997	3058.4
1998	3227.6
1999	3176.6
2000	3557
2001	4401.3
2002	4571.5
2003	5022.4
2004	5334.2
2005	5049.5
2006	5404.8
2007	5963.5
2008	6487.7
2009	6534.5
2010	6473.2
2011	7551.5
2012	8559
2013	10190.8
2014	12490.3
2015	13046.3
2016	15247.2
2017	15882.4
2018	17028.4
2019	17708
2020	18098