Year	Number
1960	9083
1961	9068
1962	9139
1963	9238
1964	9352
1965	9515
1966	9696
1967	9862
1968	10012
1969	10159
1970	10325
1971	10496
1972	10641
1973	10776
1974	10915
1975	11043
1976	11186
1977	11346
1978	11498
1979	11613
1980	11678
1981	11708
1982	11718
1983	11730
1984	11787
1985	11913
1986	12041
1987	12144
1988	12264
1989	12361
1990	12407
1991	12404
1992	12366
1993	12351
1994	12335
1995	12307
1996	12289
1997	12267
1998	12254
1999	12260
2000	12264
2001	12309
2002	12407
2003	12516
2004	12646
2005	12784
2006	12893
2007	12970
2008	13085
2009	13264
2010	13445
2011	13713
2012	14075
2013	14396
2014	14688
2015	14972
2016	15324
2017	15604
2018	15612
2019	15426
2020	15286
2021	15359
2022	15622
2023	16014