Year	Percent
1999-01-01	7.76340541245274
2000-01-01	9.02328852057384
2001-01-01	9.43444642655261
2002-01-01	9.05289326394019
2003-01-01	8.54027401246746
2004-01-01	8.99538036381609
2005-01-01	7.99410870715039
2006-01-01	6.59467082312774
2007-01-01	5.48377362330933
2008-01-01	4.73901042021013
2009-01-01	5.97891116442776
2010-01-01	7.17869656429246
2011-01-01	6.76872273953998
2012-01-01	6.99396776640823
2013-01-01	7.13711465956975