Year	Percent
1995-01-01	52.8904012263750
1996-01-01	52.8492455124732
1997-01-01	51.8406207544081
1998-01-01	51.3471431151079
1999-01-01	50.2883716466883
2000-01-01	49.1136425551505
2001-01-01	48.8326706034362
2002-01-01	46.6306659374584
2003-01-01	43.4219098605042
2004-01-01	42.6971688419718
2005-01-01	42.0849404114230
2006-01-01	41.4010315203637
2007-01-01	39.9696091595965
2008-01-01	39.5331829093849
2009-01-01	38.4269570001789
2010-01-01	37.8465123843309
2011-01-01	37.4555057292048
2012-01-01	36.6644709937033
2013-01-01	35.6107024918674
2014-01-01	35.6028357647547
2015-01-01	35.1943557531931
2016-01-01	34.1840534204003
2017-01-01	33.9938280172898