Year	kt
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	916.75
1993	2728.248
1994	3252.629
1995	3384.641
1996	3017.941
1997	2977.604
1998	3259.963
1999	2654.908
2000	2709.913
2001	4092.372
2002	6640.937
2003	10271.267
2004	12108.434
2005	12757.493
2006	13758.584
2007	14734.006
2008	15082.371
2009	15247.386
2010	16523.502
2011	16688.517
2012	18096.645
2013	20351.85
2014	21063.248
2015	21411.613
2016	19849.471