Year	Number
1960	101737
1961	92411
1962	82719
1963	73139
1964	64158
1965	56739
1966	51525
1967	47791
1968	45169
1969	43816
1970	43523
1971	44114
1972	44945
1973	45457
1974	46164
1975	46998
1976	47679
1977	48341
1978	48816
1979	49007
1980	48861
1981	48780
1982	49249
1983	50131
1984	50168
1985	48766
1986	47285
1987	46108
1988	43579
1989	39749
1990	36065
1991	32733
1992	29604
1993	26919
1994	25569
1995	24869
1996	23846
1997	22685
1998	21691
1999	20643
2000	19873
2001	19595
2002	19338
2003	18911
2004	18101
2005	16861
2006	15725
2007	15258
2008	15185
2009	15139
2010	15074
2011	15013
2012	15030
2013	14753
2014	13989
2015	12916
2016	11610
2017	9909
2018	8379
2019	7252
2020	6363
2021	5761
2022	5300