Year	Number
1960	11188
1961	11218
1962	11239
1963	11287
1964	11367
1965	11500
1966	11638
1967	11756
1968	11899
1969	12045
1970	12128
1971	12157
1972	12188
1973	12227
1974	12272
1975	12314
1976	12331
1977	12305
1978	12241
1979	12171
1980	12100
1981	12008
1982	11892
1983	11757
1984	11636
1985	11557
1986	11509
1987	11484
1988	11490
1989	11566
1990	11556
1991	11397
1992	11199
1993	10950
1994	10643
1995	10471
1996	10484
1997	10543
1998	10654
1999	10754
2000	10848
2001	10951
2002	11048
2003	11130
2004	11154
2005	11054
2006	10886
2007	10764
2008	10697
2009	10637
2010	10552
2011	10456
2012	10353
2013	10291
2014	10271
2015	10245
2016	10306
2017	10425
2018	10541
2019	10704
2020	10840
2021	10931
2022	11000
2023	11035