Year	Number
1960	39442
1961	40588
1962	41919
1963	43384
1964	44861
1965	46341
1966	47857
1967	49382
1968	50945
1969	52603
1970	54367
1971	56217
1972	58156
1973	60181
1974	62254
1975	64327
1976	66392
1977	68438
1978	70447
1979	72422
1980	74343
1981	76212
1982	78057
1983	79852
1984	81521
1985	83057
1986	84478
1987	85759
1988	86904
1989	87936
1990	88853
1991	89639
1992	90290
1993	90804
1994	91167
1995	91365
1996	91406
1997	91325
1998	91156
1999	90936
2000	90716
2001	90585
2002	90606
2003	90741
2004	90928
2005	91177
2006	91570
2007	92169
2008	93023
2009	94172
2010	95635
2011	97387
2012	99384
2013	101337
2014	103359
2015	105895
2016	108955
2017	112514
2018	116651
2019	121417
2020	126145
2021	130123
2022	134118
2023	139477