Year	hectares
1961	12000
1962	14000
1963	14000
1964	14000
1965	15000
1966	15000
1967	15000
1968	15000
1969	17000
1970	17000
1971	17000
1972	17000
1973	17000
1974	17000
1975	17000
1976	16000
1977	16000
1978	16000
1979	16000
1980	16000
1981	16000
1982	16000
1983	16000
1984	16000
1985	16000
1986	16000
1987	16000
1988	16000
1989	16000
1990	16000
1991	16000
1992	16000
1993	16000
1994	16000
1995	16000
1996	16000
1997	15000
1998	15000
1999	15000
2000	15000
2001	15000
2002	15000
2003	15000
2004	15000
2005	15000
2006	16000
2007	16000
2008	16000
2009	17000
2010	17000
2011	17000
2012	18000
2013	18000
2014	19000
2015	20000
2016	20000
2017	20000
2018	20000
2019	20000
2020	20000
2021	20000