Year	Number
1960	45110
1961	39117
1962	34589
1963	31230
1964	28094
1965	25143
1966	22769
1967	21034
1968	19984
1969	19412
1970	19109
1971	18813
1972	18299
1973	17827
1974	17613
1975	17568
1976	17633
1977	17369
1978	16872
1979	16644
1980	16398
1981	15827
1982	15474
1983	15386
1984	14851
1985	13949
1986	12896
1987	11862
1988	11070
1989	10324
1990	9667
1991	9280
1992	8785
1993	8085
1994	7453
1995	6627
1996	5775
1997	5068
1998	4412
1999	3894
2000	3561
2001	3339
2002	3109
2003	2923
2004	2819
2005	2758
2006	2718
2007	2685
2008	2674
2009	2614
2010	2493
2011	2323
2012	2164
2013	2039
2014	1947
2015	1879
2016	1832
2017	1839
2018	1815
2019	1736
2020	1668
2021	1631
2022	1608