Year	Number
1960	21022
1961	21577
1962	22118
1963	22647
1964	23186
1965	23742
1966	24304
1967	24872
1968	25446
1969	26025
1970	26607
1971	27118
1972	27732
1973	28137
1974	28658
1975	29334
1976	29945
1977	30630
1978	30865
1979	31153
1980	31465
1981	31885
1982	32111
1983	32108
1984	32338
1985	32641
1986	32885
1987	34354
1988	34470
1989	34620
1990	34750
1991	35174
1992	35309
1993	36035
1994	37034
1995	37677
1996	38347
1997	38728
1998	39342
1999	40062
2000	40339
2001	40294
2002	41486
2003	40933
2004	40663
2005	40744
2006	41489
2007	41587
2008	42403
2009	42438
2010	43487
2011	42194
2012	42453
2013	43102
2014	43671
2015	44575
2016	45099
2017	45576
2018	45934
2019	46256
2020	46598
2021	46958
2022	56766
2023	56834