Year	Percent
1996-01-01	25.2470
1997-01-01	26.2567
1998-01-01	26.9836
1999-01-01	28.2504
2000-01-01	29.1196
2001-01-01	26.8847
2002-01-01	24.8433
2003-01-01	27.2366
2004-01-01	26.0476
2005-01-01	24.0023
2006-01-01	25.8839
2007-01-01	23.8451
2008-01-01	18.6208
2009-01-01	21.8193
2010-01-01	18.8069
2011-01-01	20.9346
2012-01-01	19.5428
2013-01-01	18.6056
2014-01-01	21.4155
2015-01-01	22.8656
2016-01-01	24.8642