Year	Number
1960	7729
1961	8060
1962	8407
1963	8772
1964	9161
1965	9569
1966	9980
1967	10389
1968	10785
1969	11156
1970	11485
1971	11708
1972	11894
1973	11961
1974	12067
1975	12214
1976	12282
1977	12318
1978	12182
1979	12090
1980	12017
1981	11999
1982	11878
1983	11669
1984	11583
1985	11544
1986	11491
1987	11854
1988	11713
1989	11550
1990	11348
1991	11278
1992	11167
1993	11197
1994	11313
1995	11313
1996	11278
1997	11300
1998	11413
1999	11429
2000	11332
2001	11167
2002	11337
2003	11028
2004	10800
2005	10698
2006	10771
2007	10675
2008	10768
2009	10627
2010	10719
2011	10247
2012	10241
2013	10392
2014	10518
2015	10727
2016	10873
2017	11023
2018	11124
2019	11202
2020	11256
2021	11306
2022	13626
2023	13547