Year	Number
1960	3703
1961	3732
1962	3800
1963	3878
1964	3953
1965	4023
1966	4071
1967	4124
1968	4190
1969	4254
1970	4323
1971	4421
1972	4481
1973	4541
1974	4686
1975	4815
1976	4918
1977	4999
1978	5020
1979	5046
1980	5084
1981	5140
1982	5243
1983	5349
1984	5460
1985	5581
1986	5676
1987	5730
1988	5745
1989	5752
1990	5791
1991	5862
1992	5967
1993	6125
1994	6310
1995	6530
1996	6807
1997	7087
1998	7241
1999	7276
2000	7262
2001	7222
2002	7380
2003	7643
2004	7885
2005	8211
2006	8584
2007	8963
2008	9323
2009	9661
2010	10095
2011	10579
2012	11001
2013	11463
2014	11993
2015	12563
2016	13145
2017	13663
2018	13143
2019	12914
2020	13442
2021	13604
2022	13801
2023	14036