Year	Percent
1999-01-01	3.8776000000000000
2000-01-01	3.8445099999999996
2001-01-01	5.9682300000000000
2002-01-01	7.1510200000000000
2003-01-01	4.7151600000000000
2004-01-01	3.9108099999999997
2005-01-01	3.5701600000000000
2006-01-01	4.1337300000000000
2007-01-01	3.6734600000000000
2008-01-01	5.0812500000000000
2009-01-01	4.2990900000000005
2010-01-01	3.8183400000000000
2011-01-01	4.0455500000000000
2012-01-01	3.9510800000000000
2013-01-01	3.8239099999999997
2014-01-01	3.2522900000000003
2015-01-01	3.3286700000000000
2016-01-01	4.7595600000000000
2017-01-01	4.7884199999999995