Year	Number
1960	252400
1961	248514
1962	245806
1963	243797
1964	242132
1965	240460
1966	238586
1967	236382
1968	233968
1969	231333
1970	227843
1971	223824
1972	219878
1973	215696
1974	210846
1975	204956
1976	198716
1977	192468
1978	186233
1979	179155
1980	171047
1981	163592
1982	156403
1983	149230
1984	142819
1985	137208
1986	131737
1987	125463
1988	118828
1989	113109
1990	107953
1991	103217
1992	99004
1993	94885
1994	90599
1995	86195
1996	81802
1997	77422
1998	73280
1999	69800
2000	66629
2001	63481
2002	60538
2003	57766
2004	55210
2005	52808
2006	50563
2007	48532
2008	46711
2009	45031
2010	43426
2011	41991
2012	40662
2013	39291
2014	37651
2015	35666
2016	33746
2017	32076
2018	30475
2019	28661
2020	27154
2021	25676
2022	24213