Year	Percent
1996-01-01	32.3944
1997-01-01	32.5086
1998-01-01	30.7265
1999-01-01	29.5731
2000-01-01	28.9984
2001-01-01	28.3253
2002-01-01	30.4206
2003-01-01	28.8285
2004-01-01	27.0186
2005-01-01	27.6091
2006-01-01	28.0953
2007-01-01	29.1159
2008-01-01	34.4442
2009-01-01	35.0488
2010-01-01	74.7472
2011-01-01	127.9690
2012-01-01	79.6422
2013-01-01	67.5067
2014-01-01	60.2350
2015-01-01	56.8412
2016-01-01	53.8631