Year	Number
1960	21977
1961	22785
1962	23625
1963	24419
1964	25161
1965	25935
1966	26737
1967	27541
1968	28360
1969	29213
1970	30099
1971	30951
1972	31759
1973	32583
1974	33425
1975	34197
1976	34903
1977	35640
1978	36545
1979	37615
1980	38716
1981	39841
1982	40991
1983	42170
1984	43377
1985	44599
1986	45827
1987	47064
1988	48148
1989	49069
1990	49988
1991	50917
1992	52223
1993	53918
1994	55407
1995	56122
1996	56257
1997	56325
1998	56334
1999	56279
2000	56309
2001	56446
2002	56495
2003	56421
2004	56246
2005	55995
2006	55656
2007	55253
2008	54828
2009	54393
2010	54246
2011	54398
2012	54568
2013	54755
2014	54957
2015	55166
2016	55388
2017	55630
2018	55865
2019	56072
2020	56413
2021	56898
2022	57387
2023	57891