Year	Number
1960	237633
1961	242499
1962	246648
1963	249831
1964	251808
1965	252622
1966	252609
1967	253090
1968	254702
1969	255916
1970	256447
1971	257334
1972	258150
1973	258296
1974	258207
1975	257810
1976	256862
1977	256061
1978	255732
1979	255757
1980	256601
1981	258173
1982	260348
1983	263475
1984	266891
1985	269842
1986	273003
1987	276927
1988	281004
1989	283247
1990	283199
1991	281830
1992	277204
1993	270165
1994	263166
1995	255791
1996	247883
1997	239201
1998	229505
1999	219588
2000	209820
2001	199450
2002	189410
2003	180932
2004	173388
2005	166674
2006	161438
2007	157734
2008	155265
2009	152962
2010	150380
2011	148695
2012	148563
2013	149287
2014	150114
2015	150957
2016	152032
2017	153167
2018	153685
2019	153823
2020	153414
2021	152208
2022	151370
2023	150443