Year	Number
1964	470
1965	5000
1969	4800
1970	5000
1971	5020
1972	7370
1973	2600
1974	4000
1975	4000
1976	4000
1977	4510
1978	5000
1979	4850
1980	1440
1981	1580
1982	5500
1983	35000
1984	5500
1985	1090
1986	1080
1987	1150
1988	1620
1989	1740
1990	1991
1991	2245
1992	5509
1993	6709
1994	7218
1995	5401
1996	6026
1997	6486
1998	6276
1999	6553
2000	6840
2001	7223
2002	80488
2003	88745
2004	90335
2005	88934
2006	88014
2007	97550
2008	97851
2009	94392
2010	95044
2011	95078
2012	109923
2013	230070
2014	236085
2015	212492
2016	213515
2017	232647
2018	246746
2019	258391
2020	272826
2021	280686
2022	294632
2023	240507