Year	Number
1961	44167
1962	49404
1963	54893
1964	59971
1965	63506
1966	66795
1967	66856
1968	66452
1969	66606
1970	67946
1971	67037
1972	64865
1973	63527
1974	62361
1975	62138
1976	61003
1977	59771
1978	57977
1979	57057
1980	55452
1981	54912
1982	55335
1983	55611
1984	55414
1985	55317
1986	53947
1987	53507
1988	52765
1989	50388
1990	49400
1991	91913
1992	92000
1993	92100
1994	92150
1995	92200
1996	92215
1997	92250
1998	92270
1999	92300
2000	113306
2001	114740
2002	116175
2003	117610
2004	119044
2005	120477