Year	Percent
1991-01-01	0.953
1992-01-01	1.026
1993-01-01	1.305
1994-01-01	1.598
1995-01-01	1.393
1996-01-01	1.780
1997-01-01	2.432
1998-01-01	3.252
1999-01-01	4.271
2000-01-01	5.100
2001-01-01	6.060
2002-01-01	7.090
2003-01-01	7.770
2004-01-01	8.360
2005-01-01	9.090
2006-01-01	10.190
2007-01-01	10.700
2008-01-01	10.800
2009-01-01	10.210
2010-01-01	10.040
2011-01-01	9.330
2012-01-01	9.990
2013-01-01	10.120
2014-01-01	10.390
2015-01-01	10.020
2016-01-01	10.000