Year	hectares
1961	3500000
1962	3500000
1963	3500000
1964	3500000
1965	3500000
1966	3500000
1967	3500000
1968	3500000
1969	3500000
1970	3500000
1971	3500000
1972	3500000
1973	3500000
1974	3500000
1975	3800000
1976	3800000
1977	3800000
1978	3800000
1979	3800000
1980	3800000
1981	3800000
1982	3800000
1983	3800000
1984	3725000
1985	4574000
1986	4593000
1987	4655000
1988	4882000
1989	5273000
1990	4990000
1991	5097000
1992	5292000
1993	5060000
1994	5452000
1995	5438000
1996	4671000
1997	4814000
1998	4678000
1999	5096000
2000	4891000
2001	5128000
2002	5091000
2003	5146000
2004	5258000
2005	5264000
2006	5310000
2007	5300000
2008	5300000
2009	5500000
2010	5500000
2011	5800000
2012	5800000
2013	5800000
2014	5800000
2015	5800000
2016	5800000
2017	5800000
2018	5800000
2019	5800000
2020	5800000
2021	5800000