Year	Number
1960	4824
1961	4873
1962	4924
1963	4977
1964	5033
1965	5108
1966	5195
1967	5295
1968	5404
1969	5515
1970	5755
1971	6175
1972	6664
1973	7168
1974	7701
1975	8247
1976	8794
1977	9346
1978	9890
1979	10448
1980	11054
1981	11704
1982	12384
1983	13090
1984	13815
1985	14559
1986	15312
1987	16070
1988	16823
1989	17610
1990	18572
1991	19687
1992	20822
1993	21959
1994	23093
1995	24219
1996	25344
1997	26453
1998	27548
1999	28628
2000	29671
2001	30720
2002	31813
2003	32928
2004	34074
2005	35254
2006	36455
2007	37677
2008	38909
2009	40120
2010	41273
2011	42346
2012	43382
2013	44433
2014	45471
2015	46470
2016	47432
2017	48348
2018	49225
2019	50063
2020	50875
2021	51368
2022	51580
2023	51811