Year	Number
1960	11840
1961	11816
1962	11901
1963	12081
1964	12332
1965	12643
1966	13024
1967	13482
1968	13968
1969	14421
1970	14814
1971	15149
1972	15430
1973	15687
1974	15890
1975	15760
1976	15359
1977	14973
1978	14557
1979	14117
1980	13917
1981	14188
1982	14712
1983	15227
1984	15694
1985	16086
1986	16358
1987	16505
1988	16534
1989	16509
1990	16515
1991	16921
1992	17750
1993	18691
1994	19759
1995	20936
1996	22199
1997	23522
1998	24847
1999	26060
2000	27216
2001	28457
2002	29772
2003	31214
2004	32949
2005	35097
2006	37642
2007	40528
2008	43844
2009	47792
2010	52021
2011	55589
2012	58512
2013	61334
2014	64121
2015	66120
2016	67269
2017	68246
2018	68989
2019	69518
2020	69836
2021	69817
2022	69834
2023	70121