Year	Number
1966	26318
1967	26725
1968	27180
1969	27407
1970	27790
1971	28173
1972	28500
1973	28786
1974	29327
1975	30243
1976	31208
1977	32235
1978	33248
1979	34326
1980	34873
1981	35148
1982	35027
1983	35023
1984	35046
1985	35374
1986	35576
1987	35892
1988	36048
1989	36195
1990	36300
1991	36201
1992	36450
1993	36789
1994	37152
1995	37856
1996	37804
1997	38344
1998	38345
1999	38721
2000	38652
2001	38477
2002	38066
2003	37600
2004	37334
2005	36917
2006	36692
2007	36405
2008	36004
2009	35967
2010	35834
2011	35540
2012	35138
2013	34530
2014	33803
2015	33129
2016	32482
2017	32307
2018	32236
2019	32081
2020	31986
2021	31761
2022	31501