Year	Number
1960	9443
1961	10216
1962	11014
1963	11839
1964	12690
1965	13563
1966	14546
1967	15745
1968	17079
1969	18449
1970	19860
1971	21322
1972	22832
1973	24393
1974	26003
1975	27640
1976	29294
1977	30949
1978	32574
1979	34142
1980	35611
1981	36987
1982	38598
1983	40432
1984	42181
1985	43809
1986	45605
1987	47635
1988	49654
1989	51639
1990	53569
1991	55434
1992	57283
1993	59156
1994	61037
1995	62928
1996	64147
1997	64682
1998	65186
1999	65655
2000	66097
2001	67820
2002	70849
2003	73907
2004	76933
2005	79826
2006	80221
2007	78168
2008	76055
2009	73852
2010	71519
2011	70567
2012	71013
2013	71367
2014	71621
2015	71746
2016	72540
2017	73837
2018	75013
2019	76343
2020	77700
2021	79034
2022	79824
2023	80088