Year	kt
1990	61906.5
1991	52202.4
1992	48858.2
1993	43190.6
1994	39618.2
1995	45315.8
1996	52666.1
1997	57256.4
1998	57283.7
1999	40773.7
2000	43985.4
2001	46211.8
2002	49792.2
2003	53204
2004	57502.3
2005	50685.1
2006	53009
2007	51463.6
2008	49825.9
2009	46874.8
2010	47103.9
2011	51230.2
2012	45790.2
2013	46472.5
2014	38980.7
2015	45410.1
2016	46635
2017	47342.6
2018	46192.4
2019	46030.1
2020	46324.3