Year	Percent
1996-01-01	19.9245
1997-01-01	19.7729
1998-01-01	23.0815
1999-01-01	20.6648
2000-01-01	21.2398
2001-01-01	22.6158
2002-01-01	19.1976
2003-01-01	44.8230
2004-01-01	28.5008
2005-01-01	28.1798
2006-01-01	23.1682
2007-01-01	21.7438
2008-01-01	29.4321
2009-01-01	36.9415
2010-01-01	34.2703
2011-01-01	31.4778
2012-01-01	32.1012
2013-01-01	31.9320
2014-01-01	27.2623