Year	hectares
1961	267000
1962	267000
1963	267000
1964	266000
1965	265000
1966	266000
1967	267000
1968	268000
1969	278000
1970	278000
1971	239000
1972	239000
1973	226000
1974	196000
1975	192000
1976	195000
1977	196000
1978	192000
1979	195000
1980	210000
1981	230000
1982	250000
1983	270000
1984	280000
1985	300000
1986	320000
1987	340000
1988	360000
1989	380000
1990	400000
1991	410000
1992	420000
1993	431000
1994	450000
1995	450000
1996	450000
1997	450000
1998	450000
1999	450000
2000	450000
2001	450000
2002	450000
2003	450000
2004	450000
2005	450000
2006	450000
2007	450000
2008	450000
2009	450000
2010	450000
2011	450000
2012	450000
2013	450000
2014	450000
2015	450000
2016	450000
2017	450000
2018	450000
2019	450000
2020	450000
2021	450000