Year	Number
1960	24761
1961	24833
1962	24850
1963	24854
1964	24851
1965	24836
1966	24809
1967	24774
1968	24753
1969	24765
1970	24946
1971	25312
1972	25697
1973	26030
1974	26305
1975	26514
1976	26641
1977	26687
1978	26660
1979	26566
1980	26520
1981	26843
1982	27539
1983	28298
1984	28921
1985	29245
1986	29214
1987	28893
1988	28444
1989	28054
1990	27840
1991	27994
1992	28361
1993	28640
1994	28857
1995	29085
1996	29321
1997	29570
1998	29895
1999	30269
2000	30681
2001	31190
2002	31774
2003	32466
2004	33242
2005	33979
2006	34669
2007	35303
2008	35879
2009	36399
2010	36868
2011	37317
2012	37775
2013	38217
2014	38636
2015	39040
2016	39388
2017	39679
2018	39954
2019	40212
2020	40492
2021	40780
2022	41022
2023	41231