Year	Number of
1990	1
1991	1
1992	1
1993	1
1994	1
1995	1
1996	1
1997	1
1998	1
1999	1
2000	1
2001	1
2002	1
2003	1
2004	1
2005	1
2006	1
2007	1
2008	0
2009	0
2010	0
2011	0
2012	1
2013	1
2014	1
2015	1