Year	Number
1960	28656
1961	28793
1962	29106
1963	29538
1964	29993
1965	30360
1966	30582
1967	30665
1968	30659
1969	30628
1970	30726
1971	31045
1972	31508
1973	32086
1974	32755
1975	33454
1976	34134
1977	34761
1978	35361
1979	35936
1980	36666
1981	37688
1982	38877
1983	40187
1984	41650
1985	43236
1986	44809
1987	46280
1988	47649
1989	48902
1990	49671
1991	49948
1992	50175
1993	50447
1994	50745
1995	51052
1996	51355
1997	51685
1998	52045
1999	52411
2000	52734
2001	52994
2002	53250
2003	53522
2004	53851
2005	54239
2006	54650
2007	55070
2008	55463
2009	55796
2010	55930
2011	55871
2012	55752
2013	55586
2014	55374
2015	55118
2016	54836
2017	54528
2018	54198
2019	53854
2020	53829
2021	54127
2022	54365
2023	54544