Year	Percent
1991	0.05799
1992	0.24889
1993	0.62062
1994	0.81789
1995	0.86853
1996	0.68291
1997	0.53617
1998	0.40965
2002	0.36412
2003	0.46964
2004	0.79874
2005	0.27734
2006	0.32162
2007	0.21865
2008	0.16019
2009	1.15024
2010	1.98715
2011	1.68609
2012	1.33092
2013	1.04428
2014	0.85102
2015	0.49377
2016	0.31862
2017	0.35384