Year	Number
1960	63025
1961	65570
1962	68255
1963	71173
1964	74399
1965	77951
1966	81639
1967	85280
1968	88738
1969	91911
1970	94717
1971	97020
1972	96951
1973	94783
1974	92567
1975	90274
1976	87864
1977	85321
1978	82669
1979	79931
1980	77739
1981	76346
1982	75319
1983	74616
1984	74296
1985	74372
1986	74691
1987	74987
1988	75532
1989	76360
1990	76960
1991	77463
1992	78136
1993	78779
1994	79754
1995	80753
1996	81138
1997	81171
1998	80908
1999	80423
2000	79834
2001	79268
2002	78808
2003	78453
2004	78642
2005	79313
2006	79980
2007	80676
2008	81364
2009	81991
2010	82532
2011	82982
2012	83284
2013	83380
2014	83317
2015	83195
2016	83066
2017	82940
2018	82833
2019	82723
2020	82614
2021	82541
2022	82493
2023	82458