Year	Number
1960	10240
1961	10551
1962	10874
1963	11206
1964	11546
1965	11981
1966	12386
1967	12758
1968	13364
1969	13987
1970	14657
1971	16318
1972	18153
1973	20155
1974	22349
1975	24767
1976	27423
1977	30295
1978	32731
1979	34642
1980	36687
1981	38861
1982	41142
1983	43502
1984	46012
1985	48531
1986	50430
1987	52388
1988	54325
1989	56241
1990	58129
1991	59839
1992	61489
1993	63057
1994	64528
1995	66199
1996	68620
1997	70970
1998	73254
1999	75463
2000	78271
2001	82919
2002	87808
2003	92889
2004	98164
2005	103619
2006	109393
2007	114444
2008	119964
2009	125727
2010	131736
2011	137977
2012	144424
2013	151014
2014	158802
2015	167825
2016	176949
2017	186048
2018	194963
2019	203004
2020	209217
2021	214329
2022	217560
2023	218678