Year	Number of
1988	0
1993	0.8406
1998	1.518
2000	1.803
2001	1.611
2002	1.484
2003	1.246
2004	0.561
2005	1.028
2006	0.6982
2007	0.1001
2008	0.2925
2009	0.3031
2010	0.328
2011	0.2818