Year	Percent
1991-01-01	2.6660400000000000
1992-01-01	3.1150000000000000
1993-01-01	4.2052900000000000
1994-01-01	4.0941600000000000
1995-01-01	3.8770400000000000
1996-01-01	3.7947599999999997
1997-01-01	2.8605800000000000
1998-01-01	2.7707400000000000
1999-01-01	2.1304200000000000
2000-01-01	2.2313500000000000
2001-01-01	3.1022100000000000
2002-01-01	3.4291500000000000
2003-01-01	2.9977000000000000
2004-01-01	2.8426600000000000
2005-01-01	4.0963000000000000
2006-01-01	4.0218000000000000
2007-01-01	4.0810200000000000
2008-01-01	4.1101300000000010
2009-01-01	4.1616700000000000
2010-01-01	3.9918699999999996
2011-01-01	4.0751599999999994
2012-01-01	4.0247500000000000
2013-01-01	4.1263800000000000
2014-01-01	4.0121900000000000
2015-01-01	3.7892300000000003