Year	kt
1990	16535.5
1991	18301
1992	18469.6
1993	17075.6
1994	15960.5
1995	15483.6
1996	14862
1997	13826.1
1998	14073.1
1999	15818.1
2000	13578.9
2001	13545.4
2002	12293.4
2003	10103.3
2004	9672.3
2005	10455.9
2006	9791.8
2007	9754.3
2008	7711.6
2009	7572.7
2010	9518
2011	11357.6
2012	11954.9
2013	12216.8
2014	12010.7
2015	11988.7
2016	10450.2
2017	9781
2018	11069.9
2019	10185.3
2020	8312.5