Year	Number
1971	49810
1972	51842
1973	51790
1974	47456
1975	55564
1976	64039
1977	76180
1978	79081
1979	83901
1980	82482
1981	86833
1982	90724
1983	90815
1984	92036
1985	92017
1986	94564
1987	96691
1988	98884
1989	97912
1990	99133
1991	96599
1992	97253
1993	99590
1994	100609
1995	100676
1996	103016
1997	104349
1998	98932
1999	115011
2000	111128
2001	112467
2002	106278
2003	105330
2004	104489
2005	96188
2007	97565
2008	92047
2009	89903
2010	82344