Year	Number
1960	37549
1961	38716
1962	39970
1963	41280
1964	42594
1965	43895
1966	45187
1967	46462
1968	47738
1969	49032
1970	50339
1971	51664
1972	52995
1973	54335
1974	55698
1975	56857
1976	57776
1977	58680
1978	59550
1979	60274
1980	60899
1981	61606
1982	62782
1983	64616
1984	67134
1985	69977
1986	72596
1987	75064
1988	77177
1989	78659
1990	79921
1991	81396
1992	83259
1993	85452
1994	87412
1995	89077
1996	90648
1997	91512
1998	92207
1999	93271
2000	95333
2001	97610
2002	99065
2003	100987
2004	103202
2005	105414
2006	107738
2007	109974
2008	111735
2009	114194
2010	117016
2011	119237
2012	121456
2013	123722
2014	126326
2015	129250
2016	132657
2017	136580
2018	140938
2019	145788
2020	150973
2021	156271
2022	162448
2023	169727