Year	Number
1960	41094
1961	41206
1962	41532
1963	40928
1964	40665
1965	40406
1966	40172
1967	39793
1968	39275
1969	38947
1970	39077
1971	39222
1972	39381
1973	39322
1974	39146
1975	39259
1976	39006
1977	38639
1978	38235
1979	37925
1980	37801
1981	37652
1982	37162
1983	35962
1984	34572
1985	33263
1986	32027
1987	30481
1988	28902
1989	27468
1990	26720
1991	26417
1992	25598
1993	24368
1994	23400
1995	22479
1996	21746
1997	21034
1998	20228
1999	19227
2000	18584
2001	17909
2002	17431
2003	16951
2004	16467
2005	15995
2006	15582
2007	15098
2008	14467
2009	13943
2010	13335
2011	12814
2012	12134
2013	11523
2014	10768
2015	10166
2016	9359
2017	8917
2018	8396
2019	7928
2020	7494
2021	7149
2022	6792