Year	Number
1960	10945
1961	11295
1962	11653
1963	12019
1964	12395
1965	12784
1966	13184
1967	13603
1968	14042
1969	14497
1970	14963
1971	15446
1972	15954
1973	16484
1974	17403
1975	18725
1976	20111
1977	21586
1978	23136
1979	24729
1980	26352
1981	27934
1982	29482
1983	31169
1984	32470
1985	33354
1986	34415
1987	35666
1988	37077
1989	38575
1990	40130
1991	41735
1992	43200
1993	44107
1994	44701
1995	45585
1996	46699
1997	47837
1998	48982
1999	50117
2000	51207
2001	52252
2002	53253
2003	53596
2004	53398
2005	53361
2006	53482
2007	53779
2008	54264
2009	54918
2010	55681
2011	56545
2012	57432
2013	58071
2014	58319
2015	58541
2016	59042
2017	59763
2018	60694
2019	61924
2020	63192
2021	64312
2022	65650
2023	67603