Year	Number
1960	62435
1961	61459
1962	60809
1963	60492
1964	60680
1965	61534
1966	63064
1967	65310
1968	68173
1969	71391
1970	74813
1971	78355
1972	82023
1973	85853
1974	89909
1975	94116
1976	98272
1977	102090
1978	105318
1979	107991
1980	109617
1981	109840
1982	109566
1983	109712
1984	109914
1985	109841
1986	109923
1987	110459
1988	111199
1989	114628
1990	120681
1991	126930
1992	133719
1993	140811
1994	147722
1995	153845
1996	159179
1997	163846
1998	167798
1999	170934
2000	174385
2001	179559
2002	186036
2003	192920
2004	198973
2005	203708
2006	206609
2007	206298
2008	202734
2009	197792
2010	193910
2011	192414
2012	192747
2013	193873
2014	195899
2015	199171
2016	203752
2017	209295
2018	215325
2019	221950
2020	228178
2021	234075
2022	241408
2023	251135