Year	Number
1960	29240
1961	29172
1962	28986
1963	28697
1964	28379
1965	27834
1966	27261
1967	26613
1968	25875
1969	25110
1970	24361
1971	23600
1972	22904
1973	22334
1974	21852
1975	21460
1976	21139
1977	20816
1978	20479
1979	20154
1980	19685
1981	19233
1982	18764
1983	18245
1984	17826
1985	17528
1986	17159
1987	16913
1988	16700
1989	16525
1990	16231
1991	15892
1992	15486
1993	15082
1994	14628
1995	14131
1996	13627
1997	13094
1998	12588
1999	12123
2000	11652
2001	11197
2002	10765
2003	10328
2004	9888
2005	9457
2006	9026
2007	8626
2008	8237
2009	7873
2010	7541
2011	7240
2012	6960
2013	6700
2014	6451
2015	6202
2016	5967
2017	5738
2018	5555
2019	5419
2020	5237
2021	5046
2022	4839