Year	hectares
1961	1000
1962	1000
1963	1000
1964	1000
1965	1000
1966	1000
1967	1000
1968	1000
1969	1000
1970	1000
1971	1000
1972	1000
1973	1000
1974	1000
1975	1000
1976	1000
1977	1000
1978	1000
1979	1000
1980	1000
1981	2000
1982	2000
1983	2000
1984	3000
1985	3000
1986	4000
1987	4000
1988	4000
1989	4000
1990	4000
1991	4000
1992	4000
1993	5000
1994	5000
1995	5000
1996	6000
1997	6000
1998	6000
1999	7000
2000	10000
2001	13000
2002	12000
2003	12000
2004	11000
2005	11000
2006	11000
2007	11300
2008	11300
2009	10500
2010	10000
2011	10500
2012	10000
2013	11600
2014	9500
2015	7700
2016	8000
2017	8600
2018	8000
2019	8000
2020	8000
2021	8000