Year	Percent
1999-01-01	10.40464069146120
2000-01-01	8.67610271189926
2001-01-01	7.51288890316878
2002-01-01	8.62835580503235
2003-01-01	8.85517237644622
2004-01-01	9.53768645604004
2005-01-01	9.50662356556440
2006-01-01	9.30687653488371
2007-01-01	8.44692359388268
2008-01-01	7.58995577037981
2009-01-01	8.10266161681866
2010-01-01	8.51608472830242
2011-01-01	7.17725961907027
2012-01-01	7.40642243927877
2013-01-01	8.16721969629138
2014-01-01	7.94015598452764
2015-01-01	7.76614411219485
2016-01-01	7.56719895732075
2017-01-01	7.05750314659324