Year	Number
1960	39000
1961	34000
1962	30000
1963	27000
1964	25000
1965	25000
1966	24500
1967	24000
1968	24000
1969	25000
1970	25300
1971	25000
1972	25000
1973	25000
1974	25000
1975	20000
1976	25000
1977	20000
1978	20000
1979	25000
1980	15525
1981	17899
1982	34963
1983	37298
1984	39099
1985	40534
1986	41176
1987	41228
1988	39830
1989	39405
1990	34938
1991	34508
1992	62355
1993	57687
1994	40703
1995	34385
1996	89116
1997	84394
1998	80294
1999	82076
2000	15493
2001	14375
2002	14122
2003	16097
2004	17777
2005	21212
2006	25475
2007	30767
2008	37546
2009	38895
2010	42613
2011	47055
2012	51707
2013	55575
2014	60724
2015	72198
2016	93242
2017	115252
2018	128779
2019	135951
2020	141816
2021	152514
2022	258613
2023	257811