Year	kt
1990	999.1
1991	1024.9
1992	1055.3
1993	1085.2
1994	1121.9
1995	1161.5
1996	1230.4
1997	1289.9
1998	1362.6
1999	1433.9
2000	1494.9
2001	1568.5
2002	1630.5
2003	1707.9
2004	1772.9
2005	1835.6
2006	1901.4
2007	1978.5
2008	2012.8
2009	2124.1
2010	2502.8
2011	2621.7
2012	2468.8
2013	2160
2014	2225.7
2015	2522.3
2016	2806.5
2017	3321.6
2018	3735
2019	4517
2020	4537.9