Year	Number
1960	155086
1961	156384
1962	158189
1963	159739
1964	161462
1965	163183
1966	164203
1967	164612
1968	164937
1969	165651
1970	166309
1971	168022
1972	170508
1973	172485
1974	174562
1975	176341
1976	177052
1977	177156
1978	177279
1979	177470
1980	177856
1981	178158
1982	178028
1983	177850
1984	178017
1985	178400
1986	179262
1987	180589
1988	182158
1989	184305
1990	187088
1991	190037
1992	192813
1993	195526
1994	198196
1995	200935
1996	203711
1997	206406
1998	209265
1999	212404
2000	215218
2001	217664
2002	220026
2003	222984
2004	226576
2005	230296
2006	234135
2007	237883
2008	242384
2009	247284
2010	252173
2011	258327
2012	265181
2013	271828
2014	278610
2015	285650
2016	292233
2017	299619
2018	305653
2019	311845
2020	317212
2021	322141
2022	328709
2023	336522