Year	Number
1973	113738
1974	110355
1975	104124
1976	106819
1978	103240
1979	102459
1981	102554
1982	103001
1983	103146
1984	96336
1985	97519
1986	89860
1987	89626
1988	96413
1989	98000
1990	98953
1991	99869
1992	98722
1993	90770
1994	88976
1995	85076
1996	75498
1997	73153
1998	65336
1999	58495
2000	54807
2001	50909
2002	51028
2003	55586
2009	6734
2011	10201
2012	7063
2013	5547
2014	6470
2015	7195
2016	4945