Year	Number
1960	20678
1961	21312
1962	21924
1963	22529
1964	23135
1965	23758
1966	24395
1967	25039
1968	25688
1969	26340
1970	26992
1971	27577
1972	28297
1973	28756
1974	29279
1975	29957
1976	30559
1977	31156
1978	31285
1979	31532
1980	31795
1981	32150
1982	32302
1983	32226
1984	32379
1985	32603
1986	32767
1987	34145
1988	34286
1989	34547
1990	34757
1991	35264
1992	35454
1993	36218
1994	37170
1995	37627
1996	38070
1997	38592
1998	39504
1999	40348
2000	40792
2001	40908
2002	42238
2003	41848
2004	41811
2005	42114
2006	43110
2007	43445
2008	44554
2009	44861
2010	46283
2011	45246
2012	45851
2013	46847
2014	47687
2015	48844
2016	49579
2017	50266
2018	50828
2019	51368
2020	51864
2021	52299
2022	63113
2023	62940