Year	Number
1960	44400
1961	45500
1962	46600
1963	47700
1964	48900
1965	50100
1966	51000
1967	52000
1968	53000
1969	54000
1970	55000
1971	54600
1972	54200
1973	53800
1974	53400
1975	53000
1976	53200
1977	53400
1978	53600
1979	53800
1980	54670
1981	55050
1982	55449
1983	55930
1984	56423
1985	56898
1986	57382
1987	57849
1988	58347
1989	58841
1990	59326
1991	59021
1992	58595
1993	58910
1994	59320
1995	59746
1996	60129
1997	60497
1998	60943
1999	61285
2000	61833
2001	62504
2002	62912
2003	63325
2004	63740
2005	64154
2006	64523
2007	64888
2008	65273
2009	65636
2010	65124
2011	64564
2012	64798
2013	65001
2014	65138
2015	65237
2016	64554
2017	63873
2018	63918
2019	63911
2020	63893
2021	63764
2022	63595
2023	63489