Year	Number
1960	69833
1961	71912
1962	74823
1963	78859
1964	82311
1965	84624
1966	86718
1967	88968
1968	91323
1969	93727
1970	96148
1971	98515
1972	100694
1973	102806
1974	105025
1975	107360
1976	109815
1977	112297
1978	114707
1979	116970
1980	118806
1981	120316
1982	121786
1983	123190
1984	124540
1985	125831
1986	127055
1987	128143
1988	129161
1989	130151
1990	131003
1991	131851
1992	132663
1993	133477
1994	134679
1995	136506
1996	138789
1997	141426
1998	144465
1999	147849
2000	151586
2001	155214
2002	158598
2003	162136
2004	165209
2005	167846
2006	170702
2007	173813
2008	177254
2009	181091
2010	185097
2011	189043
2012	193282
2013	198015
2014	202804
2015	208238
2016	214540
2017	221254
2018	229128
2019	237384
2020	245768
2021	253786
2022	261566
2023	271439