Year	kt
1990	73605.7
1991	58826.5
1992	55364.1
1993	55925.2
1994	53724
1995	54882.8
1996	55301.7
1997	52994.6
1998	50477.5
1999	44322
2000	43421.1
2001	46185.6
2002	43599.9
2003	47933.3
2004	47265.7
2005	47985.6
2006	48954.8
2007	52598.7
2008	50039.3
2009	42907.8
2010	44740.6
2011	49637.6
2012	45023.1
2013	39660.7
2014	42054.4
2015	44556.5
2016	41586.7
2017	43885.1
2018	40898.2
2019	39159.9
2020	34138.1