Year	Number
1967	12864
1968	12683
1969	12490
1970	12296
1971	12177
1972	12073
1973	12021
1974	11976
1975	11865
1976	11775
1977	11678
1978	11566
1979	11448
1980	11349
1981	11287
1982	11235
1983	11191
1984	11148
1985	11071
1986	10959
1987	10868
1988	10746
1989	10600
1990	10425
1991	10203
1992	9974
1993	9722
1994	9431
1995	9136
1996	8843
1997	8452
1998	8126
1999	7859
2000	7544
2001	7267
2002	7104
2003	7002
2004	6892
2005	6781
2006	6718
2007	6522
2008	6295
2009	6047
2010	5799
2011	5535
2012	5286
2013	5006
2014	4721
2015	4471
2016	4257
2017	4067
2018	3896
2019	3740
2020	3602
2021	3470
2022	3343