Year	Number
1960	28965
1961	29413
1962	29798
1963	30191
1964	30666
1965	31220
1966	31777
1967	32353
1968	32949
1969	33569
1970	34003
1971	34148
1972	34142
1973	34061
1974	33974
1975	33917
1976	33923
1977	34011
1978	34135
1979	34294
1980	34456
1981	34568
1982	34664
1983	34772
1984	34682
1985	34380
1986	34071
1987	33755
1988	33434
1989	33120
1990	32834
1991	32916
1992	33487
1993	34212
1994	34974
1995	35779
1996	36627
1997	37483
1998	38293
1999	39039
2000	39748
2001	40383
2002	40894
2003	41329
2004	41753
2005	42209
2006	42715
2007	43270
2008	43883
2009	44522
2010	45097
2011	45588
2012	46022
2013	46401
2014	46748
2015	47087
2016	47388
2017	47658
2018	47910
2019	48156
2020	48428
2021	48709
2022	48981
2023	49246