Year	kt
1990	15422.6
1991	15740.3
1992	16845.2
1993	16952.8
1994	18804.1
1995	20917.9
1996	23997.7
1997	24953.6
1998	24469.9
1999	21614.4
2000	22051.5
2001	24251.5
2002	24172.3
2003	24655.8
2004	26177.7
2005	28220.3
2006	30126.3
2007	30635.9
2008	31688
2009	34498.5
2010	37254
2011	37096.6
2012	37085.1
2013	39701.1
2014	41801.2
2015	41390.3
2016	39791.7
2017	38549.3
2018	40273.2
2019	39631.4
2020	34431