Year	hectares
1961	11499000
1962	11499000
1963	11499000
1964	11499000
1965	11498000
1966	11498000
1967	11498000
1968	12175000
1969	12173000
1970	11197000
1971	11226000
1972	11173000
1973	10810000
1974	9776000
1975	9776000
1976	9774000
1977	9774000
1978	9774000
1979	9952000
1980	10212000
1981	9772000
1982	9852000
1983	10002000
1984	9772000
1985	9770000
1986	9770000
1987	9502000
1988	9489000
1989	9594000
1990	11036000
1991	12092000
1992	12987000
1993	12986000
1994	12985000
1995	13985000
1996	13985000
1997	13985000
1998	13984000
1999	13984000
2000	13975000
2001	13970000
2002	13960000
2003	14050000
2004	14105000
2005	14123000
2006	14137000
2007	14925000
2008	14920000
2009	14900000
2010	15100000
2011	15600000
2012	15900000
2013	16800000
2014	16800000
2015	16800000
2016	17500000
2017	17700000
2018	17700000
2019	17700000
2020	17700000
2021	17700000