Year	kt
1990	2168.6
1991	2176.4
1992	2179.6
1993	2212.5
1994	2056.1
1995	2132.1
1996	2232.4
1997	2401.8
1998	2653.2
1999	2603.3
2000	2825.2
2001	3383.8
2002	3607.1
2003	4070.8
2004	4611.2
2005	4323.9
2006	4345.4
2007	4737.2
2008	4760.2
2009	5050
2010	5042
2011	5179.5
2012	4905.7
2013	5224.5
2014	5836.9
2015	6369.7
2016	6560.9
2017	6504.3
2018	7114
2019	7467.5
2020	5491.5