Year	Number
1960	33382
1961	33673
1962	34005
1963	34359
1964	34795
1965	35245
1966	35698
1967	36180
1968	36678
1969	37078
1970	37376
1971	37618
1972	37731
1973	37765
1974	37699
1975	37510
1976	37278
1977	37166
1978	37339
1979	37559
1980	37741
1981	37951
1982	38188
1983	38487
1984	38937
1985	39482
1986	39816
1987	39982
1988	40137
1989	40429
1990	41023
1991	41814
1992	42630
1993	43385
1994	44156
1995	44916
1996	45580
1997	46048
1998	46383
1999	46784
2000	47260
2001	47573
2002	47690
2003	47895
2004	47975
2005	47915
2006	47936
2007	47737
2008	47300
2009	46817
2010	46364
2011	46003
2012	45643
2013	45213
2014	44682
2015	44003
2016	43092
2017	42092
2018	41319
2019	40810
2020	40229
2021	39693
2022	39195