Year	Percent
2000-01-01	5.12756863638464
2001-01-01	4.64034957317739
2002-01-01	3.77922664925515
2003-01-01	3.90129194262117
2004-01-01	4.02765417533329
2005-01-01	4.14779738697413
2006-01-01	4.01891028349142
2007-01-01	3.83830301411670
2008-01-01	3.70699950357197
2009-01-01	4.24977882968311
2010-01-01	4.06087763420357
2011-01-01	3.68547673991632
2012-01-01	3.44959438757059
2013-01-01	3.40540005211371
2014-01-01	3.62222912555348
2015-01-01	3.71822854821002
2016-01-01	3.85773610633894
2017-01-01	3.85890170051421