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
1990	0
1996	1200
2002	8000
2007	20700
2008	23000
2009	47031
2010	47524
2011	46597
2012	48703
2013	53406
2014	54764
2015	57195