Year	Number
1961	549789
1962	558379
1963	567963
1964	577593
1965	586905
1966	597940
1967	597162
1968	596825
1969	596634
1970	596426
1971	596244
1972	605118
1973	615822
1974	617328
1975	625840
1976	634481
1977	645623
1978	656897
1979	657100
1980	657400
1981	657606
1982	672000
1983	686000
1984	700000
1985	714000
1986	728074
1987	742200
1988	756300
1989	770400
1990	750000
1991	734149
1992	730000
1993	725000
1994	720000
1995	715000
1996	711335
1997	715000
1998	719000
1999	724000
2000	729000
2001	732521
2002	732650
2003	732780
2004	732915
2005	733050
2006	733182