Year	Total
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	0
1995	660
1996	1002
1997	1620
1998	2445
1999	3648
2000	5558
2001	9797
2002	12167
2003	15900
2004	18392
2005	20000
2006	22000
2007	24000
2008	26000
2009	28600
2010	30000
2011	32500
2012	34750
2014	38000
2015	41441
2016	41136
2017	41035