Year	kt
1990	2046.87
1991	1941.37
1992	1525.47
1993	1527.89
1994	1493.59
1995	1457.69
1996	1407.3
1997	1344.1
1998	1318
1999	1122
2000	1078.12
2001	1088.638
2002	1403.03
2003	1653.207
2004	1292.307
2005	1961.711
2006	2283.68
2007	2847.81
2008	4375.64
2009	6558.97
2010	8576.15
2011	11961.89
2012	10208.13
2013	9402.05
2014	9281.34
2015	10057.59
2016	9294.93
2017	10022.78
2018	10972.38
2019	11238.83
2020	8709.47