Year	kt
1990	2453.7
1991	2454.6
1992	2734.2
1993	2900.7
1994	3252.1
1995	3868.5
1996	3904.6
1997	4036.7
1998	4679
1999	4745.2
2000	4987.2
2001	5800.1
2002	6087.8
2003	6726.2
2004	7557.8
2005	6973.6
2006	7974.5
2007	8536.1
2008	8587.1
2009	8072.9
2010	7926.8
2011	9470.4
2012	9985.4
2013	9685
2014	9884.1
2015	10538.2
2016	10394.7
2017	9377
2018	9031.3
2019	10196.4
2020	8835.4