Year	Number
1965	12719
1966	12840
1967	12898
1968	12911
1969	12920
1970	12887
1971	12842
1972	12754
1973	12666
1974	12565
1975	12420
1976	12377
1977	12099
1978	11972
1979	11854
1980	11805
1981	11665
1982	11593
1983	11245
1984	10901
1985	10640
1986	10523
1987	10461
1988	10431
1989	10326
1990	10154
1991	9994
1992	9895
1993	9774
1994	9678
1995	9552
1996	9387
1997	9231
1998	9088
1999	8843
2000	8698
2001	8558
2002	8279
2003	7987
2004	7724
2005	7450
2006	7219
2007	7064
2008	6844
2009	6674
2010	6454
2011	6257
2012	6072
2013	5827
2014	5651
2015	5482
2016	5305
2017	5051
2018	4789
2019	4481
2020	4180
2021	3963
2022	3828