Year	Number
1960	90162
1961	89481
1962	89620
1963	90582
1964	92482
1965	94736
1966	97006
1967	98736
1968	99909
1969	99647
1970	98229
1971	96289
1972	94413
1973	92339
1974	89407
1975	85897
1976	82917
1977	79719
1978	77558
1979	74553
1980	72039
1981	70164
1982	68135
1983	66234
1984	64877
1985	63596
1986	61866
1987	59304
1988	56852
1989	55242
1990	53561
1991	52312
1992	51028
1993	49481
1994	47682
1995	45331
1996	42827
1997	40230
1998	37827
1999	35852
2000	33527
2001	31135
2002	28721
2003	26370
2004	24231
2005	22527
2006	21427
2007	20962
2008	20806
2009	20638
2010	20346
2011	20026
2012	19577
2013	19123
2014	18470
2015	17874
2016	17714
2017	17797
2018	17695
2019	16896
2020	16411
2021	15232
2022	14572