Year	Number
1961	73480
1962	76900
1963	81263
1964	86067
1965	91117
1966	97645
1967	112317
1968	117242
1969	124571
1970	130247
1971	136421
1972	147694
1973	156011
1974	165663
1975	177135
1976	186160
1977	191633
1978	207256
1979	224684
1980	236194
1981	255349
1982	271006
1983	284477
1984	300881
1985	328165
1986	344694
1987	356674
1988	364636
1989	360566
1990	383795
1991	402168
1992	404817
1993	432671
1994	437605
1995	471322
1996	471137
1997	474365
1998	481333
1999	480922
2000	431725
2001	415084
2002	347852
2003	351046
2004	358333
2005	367073
2006	376490