Year	Number
1961	600
1962	700
1963	813
1964	924
1965	850
1966	1000
1967	1048
1968	1158
1969	1233
1970	1233
1971	1233
1972	1233
1973	1233
1974	1233
1975	1233
1976	1233
1977	1233
1978	1233
1979	1233
1980	1233
1981	1233
1982	1233
1983	1233
1984	1233
1985	1233
1986	1200
1987	1200
1988	1200
1989	1200
1990	1200
1991	1190
1992	1190
1993	1190
1994	1190
1995	1190
1996	1190
1997	1227
1998	1540
1999	1855
2000	2166
2001	2602
2002	3293
2003	3310
2004	3857
2005	4166
2006	4247
2007	4475
2008	4611