Year	Number
1960	67504
1961	68068
1962	69427
1963	70898
1964	72283
1965	73565
1966	74467
1967	75413
1968	76799
1969	78352
1970	79970
1971	82029
1972	83038
1973	83651
1974	85668
1975	87377
1976	88823
1977	90146
1978	90727
1979	91624
1980	92851
1981	94209
1982	95997
1983	97377
1984	98394
1985	99212
1986	99323
1987	98569
1988	97102
1989	95494
1990	94350
1991	93540
1992	93065
1993	93221
1994	93402
1995	93721
1996	94499
1997	94979
1998	93451
1999	90272
2000	86783
2001	83853
2002	84267
2003	86445
2004	88407
2005	91141
2006	93822
2007	95782
2008	96956
2009	97489
2010	98580
2011	99837
2012	100560
2013	101578
2014	102793
2015	104016
2016	105086
2017	105543
2018	107858
2019	108051
2020	105426
2021	103640
2022	101844
2023	100086