Year	Number
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	2645
1970	1883
1971	1138
1972	653
1973	613
1974	691
1975	802
1976	909
1977	982
1978	995
1979	995
1980	995
1981	995
1982	995
1983	995
1984	995
1985	995
1986	995
1987	995
1988	995
1989	995
1990	995
1991	995
1992	995
1993	1013
1994	1122
1995	1323
1996	1560
1997	1795
1998	2050
1999	2480
2000	3086
2001	3802
2002	4579
2003	5435
2004	6827
2005	8555
2006	10386
2007	12047
2008	13448
2009	15277
2010	17266
2011	18969
2012	19971
2013	19581
2014	16566
2015	12041
2016	7395
2017	4019
2018	2893
2019	2230
2020	1514
2021	1516
2022	1000
2023	1000