Year	Number
1960	269316
1961	278685
1962	287646
1963	296041
1964	303781
1965	310799
1966	317055
1967	322549
1968	327348
1969	331561
1970	335293
1971	337791
1972	339017
1973	339656
1974	339719
1975	339271
1976	338345
1977	336966
1978	335098
1979	332609
1980	329322
1981	324363
1982	318076
1983	311683
1984	305308
1985	299049
1986	293004
1987	287268
1988	281983
1989	277312
1990	273271
1991	270496
1992	269701
1993	270078
1994	270735
1995	271627
1996	272724
1997	273947
1998	275217
1999	276392
2000	277302
2001	277798
2002	277764
2003	276397
2004	273605
2005	270005
2006	265313
2007	259773
2008	253904
2009	247822
2010	241653
2011	235546
2012	230900
2013	228723
2014	227782
2015	227146
2016	226835
2017	226872
2018	228580
2019	229880
2020	230167
2021	231014
2022	231411
2023	231589