Year	Number
1965	7460
1966	7623
1967	7891
1968	8074
1969	8304
1970	8409
1971	8602
1972	8917
1973	8296
1974	8501
1975	8823
1976	8967
1977	9120
1978	9322
1979	9572
1980	9581
1981	10314
1982	10114
1983	10129
1984	9975
1985	9932
1986	9848
1987	9876
1988	9999
1989	10100
1990	10220
1991	10332
1992	10409
1993	10869
1994	8298
1995	10402
1996	10350
1997	9675
1998	9518
1999	9783
2000	9953
2001	10102
2002	10441
2003	10680
2004	11039
2005	11360
2006	11528
2007	11617
2008	11671
2009	11831
2010	12078
2011	11823
2012	11490
2013	11240
2014	10952
2015	10668
2016	10012
2017	9604
2018	9287
2019	9212
2020	9069
2021	8902
2022	8722