Year	Number
1960	0
1965	0
1970	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	280
1995	264
1996	365
1997	466
1998	345
1999	443
2000	447
2001	489
2002	552
2003	598
2004	644
2005	660
2014	15500
2015	15500
2017	16000
2019	16000
2020	16000
2021	16000