Year	Number
1970	81191
1971	81582
1972	81582
1973	81306
1974	80844
1975	80386
1976	79944
1977	79345
1978	78586
1979	77830
1980	78036
1981	78673
1982	80177
1983	82918
1984	86531
1985	90617
1986	94539
1987	97659
1988	100101
1989	101823
1990	102689
1991	102966
1992	102433
1993	101294
1994	99609
1995	97145
1996	94793
1997	93469
1998	91775
1999	89127
2000	85029
2001	79689
2002	73920
2003	68291
2004	63468
2005	60043
2006	57891
2007	56358
2008	53888
2009	51454
2010	48912
2011	45539
2012	42014
2013	38515
2014	35818
2015	33935
2016	32055
2017	30517
2018	29147
2019	28168
2020	27194
2021	26503
2022	26075