Year	Percent
1995-01-01	36.2188264062975
1996-01-01	36.3413717371029
1997-01-01	36.9552867399612
1998-01-01	38.7244097660314
1999-01-01	39.3567226811583
2000-01-01	41.3576454969655
2001-01-01	41.6932456500423
2002-01-01	43.8420982761693
2003-01-01	48.0259072171801
2004-01-01	48.9295941002390
2005-01-01	49.4140566692860
2006-01-01	51.2517075194092
2007-01-01	53.2763310789930
2008-01-01	54.2794682826799
2009-01-01	56.0200214904015
2010-01-01	56.4616314553484
2011-01-01	57.0936194353458
2012-01-01	58.2224888485634
2013-01-01	59.4535930192950
2014-01-01	59.2173714788962
2015-01-01	58.9882692925018
2016-01-01	60.3198199809829
2017-01-01	61.0551846022623