Year	Percent
1998-01-01	6.47687064556404
1999-01-01	8.75559346835220
2000-01-01	8.82360213548714
2001-01-01	8.16537460998702
2002-01-01	7.31361401087024
2003-01-01	7.81203700373617
2004-01-01	8.32202568211794
2005-01-01	7.92800489631558
2006-01-01	7.14803378273759
2007-01-01	5.32151571745375
2008-01-01	4.39235655203761
2009-01-01	6.65873208421641
2010-01-01	7.27970720555393
2011-01-01	6.71136890161664
2012-01-01	6.97784835111470
2013-01-01	6.95379926951091
2014-01-01	6.10911473529845
2015-01-01	5.04622061600353
2016-01-01	3.95204917519629
2017-01-01	2.89081674843307