Year	hectares
1961	520000
1962	520000
1963	520000
1964	518000
1965	518000
1966	518000
1967	518000
1968	518000
1969	519000
1970	520000
1971	520000
1972	520000
1973	524000
1974	526000
1975	527000
1976	531000
1977	528000
1978	483000
1979	485000
1980	488000
1981	491000
1982	516000
1983	520000
1984	522000
1985	528000
1986	525000
1987	498000
1988	500000
1989	502000
1990	479000
1991	481000
1992	480000
1993	485000
1994	473000
1995	475000
1996	477000
1997	490000
1998	491000
1999	495000
2000	490000
2001	490000
2002	490000
2003	490000
2004	490000
2005	490000
2006	490000
2007	490000
2008	490000
2009	500000
2010	510000
2011	530000
2012	530000
2013	550000
2014	550000
2015	550000
2016	550000
2017	550000
2018	550000
2019	550000
2020	550000
2021	550000