Year	Number
1960	15035
1961	15406
1962	15731
1963	16062.999999999998
1964	16402
1965	16747
1966	17100
1967	17460
1968	17829
1969	18204
1970	18587
1971	18979
1972	19380
1973	19787
1974	20204
1975	20630
1976	21066
1977	21509
1978	21962
1979	22425
1980	22898
1981	23380
1982	23873
1983	24376
1984	25995
1985	27749
1986	29625
1987	31628
1988	33769
1989	36049
1990	38486
1991	41087
1992	43869
1993	46830
1994	49996
1995	57410
1996	65975
1997	75789
1998	87080
1999	100053
2000	114980
2001	132084
2002	140549
2003	149462
2004	158954
2005	169019
2006	179737
2007	191135
2008	203273
2009	216145
2010	229852
2011	244428
2012	259950
2013	276411
2014	293939
2015	312579
2016	332401
2017	353480
2018	375896
2019	395403
2020	415270
2021	435174
2022	454940
2023	474467