Year	Number
1960	20772
1961	21551
1962	22378
1963	23294
1964	24283
1965	25314
1966	26376
1967	27441
1968	28489
1969	29447
1970	30129
1971	30598
1972	31042
1973	31466
1974	31853
1975	32246
1976	32670
1977	33092
1978	33523
1979	34003
1980	34567
1981	35071
1982	35505
1983	36023
1984	36659
1985	37381
1986	38104
1987	38803
1988	39480
1989	40145
1990	40809
1991	41560
1992	42291
1993	42903
1994	43498
1995	44160
1996	44961
1997	45924
1998	46971
1999	47992
2000	48962
2001	49919
2002	50917
2003	51943
2004	52971
2005	53967
2006	54909
2007	55797
2008	56620
2009	57342
2010	57716
2011	57823
2012	57952
2013	58063
2014	58134
2015	58169
2016	58185
2017	58234
2018	58358
2019	58346
2020	58067
2021	57752
2022	57505
2023	57300