Year	kt
1990	1164.1
1991	1251.6
1992	1323.3
1993	1469.1
1994	1514.2
1995	1551.5
1996	1614.1
1997	1624.2
1998	1791.6
1999	2198.4
2000	2431.9
2001	2565.6
2002	2612.6
2003	2748.6
2004	2770.3
2005	2961.8
2006	3304.2
2007	3395.2
2008	3466.8
2009	3423.3
2010	3661.8
2011	3639
2012	3725
2013	3818
2014	3949.4
2015	3960.9
2016	4035.5
2017	4174.4
2018	4133.9
2019	4173.7
2020	3720.2