Year	hectares
1961	3649
1962	3699
1963	3513
1964	3434
1965	2966
1966	3254
1967	3211
1968	2980
1969	2715
1970	2559
1971	2257
1972	2095
1973	1850
1974	2018
1975	2167
1976	2202
1977	1954
1978	1983
1979	2304
1980	2406
1981	2381
1982	2850
1983	2932
1984	2562
1985	2518
1986	2442
1987	2444
1988	2645
1989	2346
1990	2378
1991	2200
1992	2379
1993	2700
1994	2800
1995	2950
1996	2000
1997	2700
1998	2823
1999	2788
2000	2923
2001	2950
2002	2510
2003	2940
2004	3001
2005	3011
2006	3100
2007	3350
2008	3500
2009	3320
2010	3234
2011	3125
2012	3076
2013	2993
2014	2892
2015	2525
2016	2647
2017	2989
2018	0
2019	0
2020	0
2021	0
2022	0