Year	hectares
1961	50
1962	50
1963	50
1964	50
1965	30
1966	2
1967	4
1968	5
1969	10
1970	10
1971	10
1972	10
1973	10
1974	10
1975	10
1976	10
1977	10
1978	10
1979	10
1980	10
1981	10
1982	10
1983	3
1984	6
1985	5
1986	7
1987	8
1988	9
1989	10
1990	10
1991	10
1992	10
1993	10
1994	11
1995	11
1996	12
1997	12
1998	13
1999	13
2000	14
2001	14
2002	15
2003	15
2004	15
2005	15
2006	16
2007	15
2008	17
2009	18
2010	18
2011	19
2012	20
2013	20
2014	20
2015	21
2016	19
2017	19