Year	Number
1960	6261
1961	6761
1962	7275
1963	7804
1964	8348
1965	8913
1966	9525
1967	10229
1968	11022
1969	11889
1970	12837
1971	13860
1972	14951
1973	16109
1974	17319
1975	18557
1976	19811
1977	21073
1978	22323
1979	23555
1980	24780
1981	26019
1982	27309
1983	28647
1984	30006
1985	31376
1986	32826
1987	34363
1988	35910
1989	37445
1990	38959
1991	40463
1992	41960
1993	43434
1994	44876
1995	46281
1996	47067
1997	47233
1998	47362
1999	47476
2000	47593
2001	48829
2002	51195
2003	53592
2004	56003
2005	58398
2006	58718
2007	57020
2008	55375
2009	53732
2010	52106
2011	51344
2012	51422
2013	51472
2014	51536
2015	51591
2016	52153
2017	53251
2018	54305
2019	55337
2020	56310
2021	57212
2022	57663
2023	57689