Year	hectares
1961	124000
1962	134000
1963	129000
1964	132000
1965	140000
1966	149000
1967	153000
1968	153000
1969	149000
1970	149000
1971	149000
1972	168000
1973	168000
1974	155000
1975	167000
1976	161000
1977	149000
1978	188000
1979	184000
1980	183000
1981	134000
1982	133000
1983	133000
1984	169000
1985	154000
1986	154000
1987	164000
1988	177000
1989	192000
1990	180000
1991	183000
1992	179000
1993	178000
1994	178000
1995	178000
1996	178000
1997	178000
1998	178000
1999	178000
2000	178000
2001	178000
2002	178000
2003	178000
2004	178000
2005	178000
2006	177000
2007	177000
2008	177000
2009	177000
2010	177000
2011	177000
2012	177000
2013	177000
2014	177000
2015	177000
2016	177000
2017	177000
2018	177000
2019	177000
2020	177000
2021	177000