Year	Number
1960	41303
1961	42494
1962	43550
1963	44491
1964	45273
1965	45931
1966	46568
1967	47165
1968	47708
1969	48188
1970	48575
1971	48840
1972	48970
1973	48963
1974	48805
1975	48467
1976	48021
1977	47568
1978	47152
1979	46775
1980	46392
1981	45862
1982	45228
1983	44675
1984	44222
1985	43859
1986	43542
1987	43237
1988	42921
1989	42578
1990	42185
1991	41679
1992	41121
1993	40595
1994	40077
1995	39523
1996	38884
1997	38171
1998	37419
1999	36667
2000	35973
2001	35349
2002	34723
2003	34023
2004	33249
2005	32435
2006	31554
2007	30624
2008	29736
2009	28907
2010	28120
2011	27378
2012	26719
2013	26138
2014	25630
2015	25182
2016	24727
2017	24312
2018	23953
2019	23606
2020	23310
2021	23049
2022	22791
2023	22504