Year	Number
1969	15000
1970	15000
1971	15000
1972	14700
1973	15400
1974	14350
1977	16000
1978	16000
1979	16000
1980	17800
1981	17000
1982	850
1983	1100
1984	1420
1985	1890
1986	1800
1987	1900
1988	2007
1989	2118
1990	1750
1991	1720
1992	1990
1993	2225
1994	2172
1995	1612
1996	1591
1997	290
1998	157
1999	186
2000	130
2001	62
2002	62
2003	62
2004	245
2005	409
2006	716
2007	200904
2008	201160
2009	201310
2010	201544
2011	202013
2012	203635
2013	204331
2014	173591
2015	173745
2016	172047
2017	122804
2018	67283
2019	67749
2020	68089
2021	39328
2022	29341
2023	29336