Year	Percent
1991-01-01	0.013808000000000000
1992-01-01	0.017244000000000000
1993-01-01	0.016590000000000000
1994-01-01	0.017046000000000002
1995-01-01	0.028056000000000000
1996-01-01	0.012790000000000001
1997-01-01	0.020543000000000002
1998-01-01	0.026567000000000000
1999-01-01	0.022159000000000000
2000-01-01	0.017580000000000002
2001-01-01	0.020284000000000000
2002-01-01	0.021719000000000000
2003-01-01	0.019402000000000003
2004-01-01	0.021195000000000000
2005-01-01	0.017594000000000000
2006-01-01	0.016000000000000000
2007-01-01	0.020403000000000000
2008-01-01	0.022667000000000000
2009-01-01	0.023191000000000000
2010-01-01	0.021905000000000000
2011-01-01	0.023296000000000000
2012-01-01	0.025378000000000000
2013-01-01	0.026185000000000003
2014-01-01	0.024405000000000000
2015-01-01	0.027270999999999997