Year	Number
1969	38538
1970	39649
1971	40633
1972	53692
1973	41266
1974	41444
1975	42423
1976	43202
1977	43514
1978	43743
1979	43947
1980	43540
1981	43636
1982	43313
1983	42198
1984	41239
1985	40533
1986	40106
1987	40018
1988	40596
1989	41379
1990	42246
1991	43152
1992	43943
1993	51058
1994	42102
1995	41534
1996	43508
1997	42000
1998	40219
1999	39816
2000	39743
2001	39157
2002	38969
2003	38996
2004	38948
2005	38858
2006	38450
2007	37735
2008	36967
2009	36255
2010	35802
2011	34924
2012	33513
2013	32152
2014	30867
2015	29587
2016	27959
2017	26281
2018	25001
2019	24066
2020	23313
2021	22593
2022	21914