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	2280
1992	3500
1993	5300
1994	7500
1995	10791
1996	12500
1997	17691
1998	22531
1999	37541
2000	114444
2001	239416
2002	276859
2003	289992
2004	306067
2005	323980
2006	346771
2007	368530
2008	385636
2009	422083
2010	455579
2011	521748
2012	532228
2013	556652
2014	546229
2015	524161
2016	564591
2017	560010