Year	Number
1961	169776
1962	176648
1963	180067
1964	185072
1965	191771
1966	198700
1967	206634
1968	209857
1969	218173
1970	226485
1971	225275
1972	222500
1973	221802
1974	224191
1975	226115
1976	232623
1977	233046
1978	231107
1979	231204
1980	230369
1981	232659
1982	230916
1983	229950
1984	230212
1985	229514
1986	229172
1987	219713