Year	Percent
1991	0.34272
1992	0.40266
1993	0.45267
1994	0.45205
1995	0.62242
1996	0.76305
1997	0.79414
1998	0.76214
1999	0.74201
2000	0.67266
2001	0.83273
2002	0.9831
2003	1.39917
2004	1.49592
2005	1.27856
2006	1.05139
2007	1.12064
2008	1.19498
2009	1.23059
2010	1.27318
2011	0.63563
2012	0.61589
2013	0.61934
2014	0.54914
2015	0.26164
2016	0.12517
2017	0.05925
2018	0.09525
2019	0.0579