Year	Number
1964	55492
1965	55432
1966	55432
1967	55428
1968	55436
1969	55372
1970	55247
1971	55242
1972	55232
1973	55216
1974	55158
1975	55043
1976	54854
1977	54611
1978	54367
1979	54238
1980	54082
1981	53757
1982	53251
1983	52589
1984	52061
1985	51580
1986	51136
1987	50602
1988	50109
1989	49685
1990	49182
1991	49253
1992	49545
1993	49587
1994	49822
1995	49801
1996	49783
1997	50162
1998	50680
1999	51451
2000	52127
2001	52517
2002	52910
2003	53291
2004	53819
2005	54366
2006	54594
2007	54611
2008	54721
2009	54930
2010	55199
2011	55402
2012	55559
2013	55348
2014	55104
2015	55080
2016	55031
2017	55047
2018	55070
2019	54940
2020	54889
2021	54884
2022	54876