Year	Number of
1985	0.04836
1987	0.03767
1989	0.03037
1992	0.01151
1996	0.5407
1998	0
1999	0.01546
2000	0.01913
2001	0.01912
2002	0.00765
2004	0.01909
2005	0.03053
2006	0.00381
2007	0.00762
2008	0.00381
2009	0
2010	0
2011	0