Year	Number
1960	51820
1961	53021
1962	54304
1963	55518
1964	56598
1965	57420
1966	57967
1967	58350
1968	58838
1969	59499
1970	60209
1971	61161
1972	62459
1973	63929
1974	65521
1975	67206
1976	68850
1977	70485
1978	71988
1979	73376
1980	74972
1981	76782
1982	78885
1983	81323
1984	84156
1985	87355
1986	90753
1987	94438
1988	98215
1989	102933
1990	106912
1991	108472
1992	110196
1993	112085
1994	114073
1995	116144
1996	118314
1997	120590
1998	122999
1999	125660
2000	128738
2001	132028
2002	136835
2003	142030
2004	147447
2005	152772
2006	157707
2007	162256
2008	166511
2009	170506
2010	174546
2011	178950
2012	183667
2013	188612
2014	193943
2015	199572
2016	205599
2017	211689
2018	217760
2019	224287
2020	230308
2021	234835
2022	239483
2023	245158