Year	Number
1961	72000
1962	82000
1963	93000
1964	103000
1965	114000
1966	124000
1967	134500
1968	145000
1969	155400
1970	165870
1971	183500
1972	201000
1973	218500
1974	236000
1975	323113
1976	350000
1977	370000
1978	428000
1979	485000
1980	545205
1981	569000
1982	593000
1983	617000
1984	641000
1985	666309
1986	678803
1987	691297
1988	703790
1989	716285
1990	728779
1991	741272
1992	753766
1993	766260
1994	778754
1995	791248
1996	803742
1997	802173
1998	800604
1999	799035
2000	797466
2001	795898
2002	794329
2003	792760
2004	791191
2005	789622
2006	788053