Year	Number
1960	29759
1961	30466
1962	30940
1963	31424
1964	31924
1965	32437
1966	32952
1967	33384
1968	33688
1969	33912
1970	34083
1971	34224
1972	34636
1973	35432
1974	36373
1975	37332
1976	38187
1977	38894
1978	39496
1979	40005
1980	40396
1981	40636
1982	40959
1983	41440
1984	41898
1985	42319
1986	42671
1987	42917
1988	43092
1989	43336
1990	43821
1991	44644
1992	46002
1993	47864
1994	49909
1995	52075
1996	54305
1997	56452
1998	58508
1999	60477
2000	62215
2001	63457
2002	64311
2003	65073
2004	65794
2005	66476
2006	67133
2007	67787
2008	68443
2009	69102
2010	69879
2011	70693
2012	71335
2013	71805
2014	72123
2015	72305
2016	72392
2017	72417
2018	72394
2019	72341
2020	72171
2021	72080
2022	71975
2023	71665