Year	Number
1960	59872
1961	61601
1962	63472
1963	65356
1964	67221
1965	69073
1966	70897
1967	72810
1968	74821
1969	76934
1970	79145
1971	81440
1972	83814
1973	86278
1974	88835
1975	91495
1976	94267
1977	97159
1978	100181
1979	103304
1980	106503
1981	109788
1982	113154
1983	116631
1984	120235
1985	123956
1986	127804
1987	131782
1988	135875
1989	140089
1990	144149
1991	147041
1992	142032
1993	136259
1994	137215
1995	139855
1996	143642
1997	147485
1998	151778
1999	156240
2000	160583
2001	165179
2002	170103
2003	175441
2004	181256
2005	187106
2006	192432
2007	197364
2008	202097
2009	206596
2010	210867
2011	214913
2012	218720
2013	222335
2014	225895
2015	229502
2016	233169
2017	237477
2018	242359
2019	247106
2020	251613
2021	255821
2022	259741
2023	263449