Year	Number
1961	172506
1962	180415
1963	184638
1964	190469
1965	198126
1966	205896
1967	214582
1968	218483
1969	227894
1970	237231
1971	236986
1972	235170
1973	235582
1974	238979
1975	241287
1976	248924
1977	250736
1978	249874
1979	251051
1980	251638
1981	254958
1982	254040
1983	253686
1984	254615
1985	254614
1986	254979
1987	246510
1988	238500
1989	235505
1990	233231
1991	230322
1992	221514
1993	213078
1994	218638
1995	224909
1996	208847