Year	Percent
2000-01-01	3.44347956471706
2001-01-01	3.56792043230549
2002-01-01	3.90877179102471
2003-01-01	4.34295014773587
2004-01-01	4.57265729984941
2005-01-01	4.55079475854027
2006-01-01	3.44981751644870
2007-01-01	2.55891494690350
2008-01-01	2.71670691669107
2009-01-01	3.55196798043948
2010-01-01	4.03931122451350
2011-01-01	3.41926571246691
2012-01-01	3.55951307826516
2013-01-01	3.59468998893529
2014-01-01	3.70644886166038
2015-01-01	4.55946523320406
2016-01-01	5.35852712406926
2017-01-01	4.58133616893195