Year	hectares
1961	438000
1962	438000
1963	438000
1964	438000
1965	438000
1966	438000
1967	434000
1968	434000
1969	432000
1970	432000
1971	432000
1972	432000
1973	432000
1974	433000
1975	433000
1976	433000
1977	434000
1978	434000
1979	434000
1980	435000
1981	440000
1982	450000
1983	455000
1984	460000
1985	465000
1986	470000
1987	475000
1988	480000
1989	490000
1990	499000
1991	499000
1992	500000
1993	500000
1994	500000
1995	500000
1996	500000
1997	510000
1998	520000
1999	530000
2000	548000
2001	548000
2002	548000
2003	548000
2004	548000
2005	548000
2006	540000
2007	540000
2008	540000
2009	540000
2010	568890
2011	565000
2012	565000
2013	565000
2014	565000
2015	565000
2016	565000
2017	565000
2018	565000
2019	565000
2020	565000
2021	565000