Year	kt
1990	54562.8
1991	55132.7
1992	52280.5
1993	53461.8
1994	59927.6
1995	56092.5
1996	62574.4
1997	60624
1998	57265.6
1999	56509.9
2000	55097.5
2001	61088.1
2002	63439.7
2003	71708.1
2004	67682.9
2005	55460.2
2006	67024.9
2007	65102.7
2008	56660.1
2009	54180.9
2010	62526.4
2011	55123.4
2012	49408.1
2013	50191.3
2014	46161.7
2015	42815.4
2016	45700.3
2017	43015.4
2018	44395.5
2019	40987.1
2020	36329.9