Year	hectares
1961	4000
1962	4000
1963	4000
1964	4000
1965	4000
1966	4000
1967	4000
1968	4000
1969	4000
1970	4000
1971	4000
1972	4000
1973	4000
1974	4000
1975	4000
1976	4000
1977	4000
1978	4000
1979	4000
1980	4000
1981	4000
1982	4000
1983	4000
1984	4000
1985	4000
1986	4000
1987	4000
1988	4000
1989	4000
1990	4000
1991	4000
1992	4000
1993	4000
1994	4000
1995	4000
1996	4000
1997	4000
1998	4000
1999	4000
2000	4000
2001	3900
2002	3370
2003	3240
2004	3110
2005	2980
2006	2850
2007	2720
2008	2590
2009	2460
2010	2330
2011	2200
2012	2070
2013	1940
2014	1830
2015	1810
2016	1780
2017	1750
2018	1740
2019	1730
2020	1730
2021	1730