Year	Percent
1999-01-01	8.71609924985574
2000-01-01	10.19590858577770
2001-01-01	10.84933281451500
2002-01-01	10.13320950969400
2003-01-01	9.45956928450432
2004-01-01	9.65658995972790
2005-01-01	8.63590117469566
2006-01-01	6.91062349478191
2007-01-01	5.55204609210628
2008-01-01	4.74716805622420
2009-01-01	6.48494646534158
2010-01-01	8.07009415455371
2011-01-01	7.75464726497029
2012-01-01	7.74184968462649
2013-01-01	7.98273899848255