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	2000
1975	2000
1976	2000
1977	2000
1978	1000
1979	2000
1980	4000
1981	5000
1982	6000
1983	7000
1984	8000
1985	8000
1986	8000
1987	9000
1988	9000
1989	9000
1990	10000
1991	9000
1992	12000
1993	13000
1994	13000
1995	13000
1996	13000
1997	13000
1998	13000
1999	13000
2000	13000
2001	13300
2002	12700
2003	13200
2004	12200
2005	12000
2006	12700
2007	13400
2008	14100
2009	14900
2010	15330
2011	16080
2012	16460
2013	17100
2014	18500
2015	18500
2016	18300
2017	19000
2018	21000
2019	21000
2020	21000
2021	21000