Year	Number
1960	11306
1961	11465
1962	11589
1963	11707
1964	11815
1965	11932
1966	12084
1967	12258
1968	12434
1969	12613
1970	12789
1971	12968
1972	13088
1973	13077
1974	12952
1975	12718
1976	12481
1977	12296
1978	12074
1979	11805
1980	11521
1981	11293
1982	11150
1983	11051
1984	10960
1985	10852
1986	10807
1987	10856
1988	10922
1989	11019
1990	11160
1991	11366
1992	11603
1993	11785
1994	11917
1995	11979
1996	12056
1997	12182
1998	12264
1999	12275
2000	12241
2001	12273
2002	12350
2003	12389
2004	12384
2005	12324
2006	12249
2007	12214
2008	12200
2009	12176
2010	12176
2011	12189
2012	12209
2013	12247
2014	12272
2015	12305
2016	12315
2017	12372
2018	12575
2019	12828
2020	13011
2021	13089
2022	13084
2023	13051