Year	Number
1960	14127
1961	14607
1962	15067
1963	15507
1964	15855
1965	16183
1966	16500
1967	16791
1968	17162
1969	17566
1970	17952
1971	18325
1972	18688
1973	19060
1974	19481
1975	19941
1976	20442
1977	20963
1978	21500
1979	22028
1980	22482
1981	22843
1982	23231
1983	23670
1984	24067
1985	24501
1986	25077
1987	25650
1988	26132
1989	26594
1990	27086
1991	27621
1992	28187
1993	28759
1994	29361
1995	30028
1996	30636
1997	31190
1998	31679
1999	32077
2000	32512
2001	33022
2002	33519
2003	33928
2004	34327
2005	34776
2006	35297
2007	35981
2008	36764
2009	37599
2010	38598
2011	39723
2012	40969
2013	42331
2014	43770
2015	45283
2016	46732
2017	48190
2018	49840
2019	51589
2020	53400
2021	55601
2022	58542
2023	61947