Year	kt
1990	22762.3
1991	20422.9
1992	13764.1
1993	10080.7
1994	6544.5
1995	4594.3
1996	5760.6
1997	5679.5
1998	6022.3
1999	4784.7
2000	4643.3
2001	3962.1
2002	4965.1
2003	5579.7
2004	5557.9
2005	5307
2006	5362.3
2007	6473.1
2008	7441.5
2009	6734.6
2010	6394.4
2011	7690.4
2012	10146
2013	9455
2014	9848.5
2015	10266.6
2016	9675.6
2017	9439
2018	11306.8
2019	10017.4
2020	9080.1