Year	Number
1969	30946
1970	31503
1971	32071
1972	32580
1973	33290
1974	34320
1975	35346
1976	36384
1977	37614
1978	38839
1979	39830
1980	40754
1981	41718
1982	42796
1983	43805
1984	44309
1985	44699
1986	45121
1987	45608
1988	46133
1989	46173
1990	46134
1991	46128
1992	46083
1993	46160
1994	46843
1995	47964
1996	48364
1997	48142
1998	48257
1999	48028
2000	47801
2001	47437
2002	46612
2003	46043
2004	45699
2005	45537
2006	45106
2007	44492
2008	44113
2009	43749
2010	43355
2011	43064
2012	42817
2013	43951
2014	45065
2015	45803
2016	46504
2017	47154
2018	47299
2019	47196
2020	46828
2021	46363
2022	45976