Year	Percent
1999-01-01	5.60604
2000-01-01	4.14771
2001-01-01	3.56720
2002-01-01	3.34121
2003-01-01	3.34121
2004-01-01	3.34121
2005-01-01	3.34121
2006-01-01	3.34121
2007-01-01	3.34121
2008-01-01	3.34121
2009-01-01	3.34121
2010-01-01	3.21660
2011-01-01	2.46956
2012-01-01	2.79595
2013-01-01	7.43340
2014-01-01	10.73090
2015-01-01	13.81430
2016-01-01	15.67980