Year	Number
1960	28443
1961	29022
1962	29495
1963	29932
1964	30343
1965	30719
1966	31053
1967	31332
1968	31547
1969	31712
1970	31824
1971	31808
1972	31777
1973	31736
1974	31688
1975	31638
1976	31581
1977	31501
1978	31398
1979	31278
1980	31213
1981	31402
1982	31883
1983	32475
1984	33001
1985	33368
1986	33524
1987	33476
1988	33286
1989	33118
1990	33108
1991	33422
1992	34095
1993	34723
1994	35313
1995	35869
1996	36396
1997	36899
1998	37387
1999	37869
2000	38351
2001	38770
2002	38869
2003	39045
2004	39317
2005	39576
2006	39832
2007	40090
2008	40354
2009	40624
2010	40900
2011	41208
2012	41576
2013	41979
2014	42397
2015	42829
2016	43274
2017	43730
2018	44193
2019	44667
2020	45183
2021	45724
2022	46246
2023	46762