Year	Number
1960	150908
1961	154746
1962	158200
1963	161830
1964	166502
1965	171407
1966	175617
1967	179733
1968	184087
1969	188127
1970	191653
1971	195335
1972	199249
1973	203011
1974	206867
1975	210306
1976	213139
1977	215741
1978	217777
1979	218512
1980	217554
1981	215255
1982	212575
1983	210306
1984	208639
1985	207549
1986	208231
1987	211349
1988	215916
1989	220580
1990	224290
1991	227608
1992	229373
1993	229620
1994	229916
1995	230657
1996	232700
1997	235325
1998	237746
1999	240547
2000	243620
2001	246459
2002	250103
2003	254270
2004	257909
2005	261161
2006	264151
2007	266397
2008	267087
2009	265644
2010	262382
2011	260155
2012	260080
2013	260811
2014	262533
2015	264160
2016	265009
2017	265951
2018	266728
2019	268236
2020	270185
2021	270176
2022	271700
2023	275634