Year	Number
1960	7194
1961	7718
1962	8401
1963	8841
1964	9167
1965	9533
1966	9911
1967	10297
1968	10706
1969	11169
1970	11708
1971	12314
1972	12862
1973	13248
1974	13575
1975	13920
1976	14283
1977	14724
1978	15246
1979	15949
1980	16699
1981	17459
1982	18243
1983	18906
1984	19405
1985	19829
1986	20379
1987	21085
1988	21931
1989	22912
1990	23939
1991	25054
1992	26117
1993	26962
1994	27713
1995	28182
1996	28567
1997	29031
1998	29634
1999	30510
2000	31415
2001	32188
2002	32810
2003	33431
2004	34049
2005	34693
2006	35310
2007	35952
2008	36753
2009	37865
2010	39213
2011	40668
2012	42410
2013	44487
2014	46935
2015	49809
2016	52919
2017	55990
2018	58917
2019	61757
2020	64718
2021	67779
2022	70505
2023	73379