Year	Number
1961	78720
1962	83900
1963	88995
1964	95489
1965	101872
1966	109696
1967	125145
1968	129948
1969	137132
1970	143074
1971	149633
1972	159740
1973	176336
1974	191406
1975	207930
1976	221771
1977	232838
1978	255337
1979	279912
1980	297645
1981	322943
1982	346128
1983	375817
1984	411344
1985	457845
1986	493494
1987	520276
1988	538689
1989	543186
1990	575823
1991	597326
1992	607057
1993	634477
1994	638858
1995	672460
1996	672075
1997	735792
1998	682533
1999	688742
2000	638223
2001	645277
2002	589945
2003	592511
2004	589282
2005	634372
2006	652999
2007	668993