Year	Number of
1986	0.5672
1989	1.957
1990	2.3
1991	1.666
1992	1.392
1993	1.116
1994	1.321
1995	1.464
1996	1.63
1997	1.138
1998	1.459
1999	1.517
2001	1.08
2002	1.785
2003	1.696
2004	1.663
2005	1.783
2006	1.576
2007	1.134
2008	1.07
2009	0.9263
2010	1.022
2011	1.282