Year	hectares
1961	40
1962	40
1963	24
1964	12
1965	16
1966	20
1967	20
1968	26
1969	28
1970	25
1971	35
1972	40
1973	49
1974	50
1975	50
1976	50
1977	50
1978	50
1979	50
1980	0