Year	Number
1960	136143
1961	140891
1962	145392
1963	149575
1964	153397
1965	156822
1966	159830
1967	162437
1968	164687
1969	166645
1970	168374
1971	169577
1972	170236
1973	170602
1974	170663
1975	170461
1976	170017
1977	169337
1978	168399
1979	167131
1980	165437
1981	162859
1982	159584
1983	156269
1984	152997
1985	149823
1986	146798
1987	143965
1988	141385
1989	139123
1990	137168
1991	135850
1992	135595
1993	135974
1994	136477
1995	137082
1996	137765
1997	138485
1998	139206
1999	139859
2000	140366
2001	140657
2002	140679
2003	140032
2004	138680
2005	136941
2006	134652
2007	131923
2008	129024
2009	126008
2010	122936
2011	119882
2012	117550
2013	116438
2014	115929
2015	115569
2016	115364
2017	115329
2018	116167
2019	116774
2020	116858
2021	117270
2022	117461
2023	117534