Year	Number
1960	46469
1961	46195
1962	48087
1963	50193
1964	52468
1965	54825
1966	57460
1967	60566
1968	64086
1969	68023
1970	72382
1971	76020
1972	78607
1973	80914
1974	82917
1975	84589
1976	85906
1977	86869
1978	87504
1979	87827
1980	87863
1981	88914
1982	91410
1983	94207
1984	97012
1985	99884
1986	102848
1987	105906
1988	109064
1989	112260
1990	115387
1991	118250
1992	120632
1993	122718
1994	124887
1995	127180
1996	129647
1997	132487
1998	135698
1999	139187
2000	142941
2001	147464
2002	153744
2003	161275
2004	169028
2005	176779
2006	184368
2007	191829
2008	199088
2009	205940
2010	212396
2011	217685
2012	220626
2013	222242
2014	223757
2015	225176
2016	226503
2017	227543
2018	228210
2019	228582
2020	228863
2021	228992
2022	228830
2023	228603