Year	hectares
1961	3000
1962	4000
1963	4000
1964	4000
1965	4000
1966	4000
1967	4000
1968	3000
1969	3000
1970	4000
1971	2000
1972	3000
1973	3000
1974	2000
1975	2000
1976	2000
1977	2000
1978	2000
1979	2000
1980	2000
1981	2000
1982	2000
1983	2000
1984	2000
1985	2000
1986	2000
1987	2000
1988	2000
1989	1000
1990	1000
1991	1000
1992	1000
1993	1000
1994	1000
1995	1000
1996	1000
1997	1000
1998	1000
1999	1000
2000	1000
2001	1000
2002	1000
2003	600
2004	700
2005	660
2006	650
2007	700
2008	600
2009	600
2010	640
2011	630
2012	630
2013	570
2014	560
2015	560
2016	560
2017	560
2018	560
2019	560
2020	560
2021	560