Year	Number
1960	70266
1961	70038
1962	69498
1963	69028
1964	68560
1965	68165
1966	67909
1967	67735
1968	67686
1969	67861
1970	68324
1971	69113
1972	70192
1973	71421
1974	72708
1975	74035
1976	75377
1977	76668
1978	77865
1979	78946
1980	79984
1981	80972
1982	81816
1983	82525
1984	83126
1985	83670
1986	84205
1987	84752
1988	85298
1989	85809
1990	86300
1991	86936
1992	87662
1993	88289
1994	88814
1995	89258
1996	89698
1997	90152
1998	90605
1999	91043
2000	91441
2001	91995
2002	92660
2003	93304
2004	94034
2005	94836
2006	95653
2007	96400
2008	96954
2009	97293
2010	97578
2011	97881
2012	98123
2013	98301
2014	98417
2015	98509
2016	98612
2017	98629
2018	98514
2019	98302
2020	97972
2021	97536
2022	97091
2023	96741