Year	Percent
1995-01-01	25.3445769732035
1996-01-01	25.4364408166704
1997-01-01	25.1333350978068
1998-01-01	24.7779910211189
1999-01-01	24.2002433267777
2000-01-01	23.8505169737859
2001-01-01	23.6673614938760
2002-01-01	22.6074625963666
2003-01-01	21.8414060303035
2004-01-01	21.8700431256358
2005-01-01	22.2714380631736
2006-01-01	22.2897066148695
2007-01-01	21.7364863085594
2008-01-01	21.6147423841648
2009-01-01	22.0451472048972
2010-01-01	22.1935767460334
2011-01-01	22.2472102688996
2012-01-01	22.2076705448431
2013-01-01	21.9679803952220
2014-01-01	22.2397320964322
2015-01-01	22.0336981942306
2016-01-01	21.8899376742237
2017-01-01	21.5433201862775