Year	Number
1973	291116
1974	236073
1975	207246
1976	185514
1977	175112
1978	172831
1979	185666
1980	176376
1981	181922
1982	198497
1983	226088
1984	218932
1985	229414
1986	224761
1987	213008
1988	202321
1989	191930
1990	190988
1991	163218
1992	151144
1993	177728
1994	194434
1995	198879
1996	221989
1997	244299
1999	200358
2000	186354
2001	135953
2002	110336
2003	99116
2004	80858
2005	71568
2006	63815
2007	60720
2008	36745
2016	61