Year	Number
1970	69500
1971	71800
1972	68900
1973	74100
1974	79500
1975	88000
1976	98400
1977	103400
1978	117200
1979	122300
1980	136100
1981	129100
1982	112300
1983	114400
1984	117700
1985	123500
1986	128400
1987	122100
1988	123700
1989	128000
1990	130300
1991	120300
1992	66300
1993	68200
1994	69200
1995	74100
1996	75100
1997	85500
1998	90500
1999	83900
2000	77273
2001	46364