Year	Number
1960	35201
1961	34564
1962	33583
1963	32149
1964	30021
1965	27311
1966	24581
1967	22243
1968	20482
1969	19315
1970	18658
1971	18257
1972	17883
1973	17264
1974	16119
1975	14481
1976	12660
1977	10894
1978	9373
1979	8204
1980	7358
1981	6681
1982	6069
1983	5570
1984	5281
1985	5201
1986	5221
1987	5234
1988	5175
1989	5013
1990	4744
1991	4409
1992	4019
1993	3649
1994	3354
1995	3101
1996	2905
1997	2765
1998	2638
1999	2482
2000	2292
2001	2130
2002	2020
2003	1924
2004	1837
2005	1780
2006	1759
2007	1774
2008	1808
2009	1826
2010	1811
2011	1776
2012	1733
2013	1696
2014	1665
2015	1622
2016	1555
2017	1473
2018	1411
2019	1373
2020	1335
2021	1293
2022	1247