Year	kt
1990	20341.4
1991	14744.9
1992	15031.2
1993	15536.5
1994	14865
1995	15452.9
1996	15254.4
1997	17069.6
1998	18527.5
1999	18513.6
2000	18034.4
2001	19196
2002	20276.7
2003	21607.9
2004	21092.7
2005	21445
2006	21598.3
2007	22872
2008	21726.3
2009	20305.9
2010	19457.3
2011	19027.6
2012	17403
2013	17010.6
2014	16236.4
2015	16602.3
2016	16876.8
2017	17407.9
2018	16433.4
2019	16523.3
2020	15626.9