Year	Percent
1999-01-01	1.80410723228422
2000-01-01	1.71260481574914
2001-01-01	1.74715482813598
2002-01-01	1.93519935962483
2003-01-01	2.12350280481991
2004-01-01	2.41895516059246
2005-01-01	2.56210864424875
2006-01-01	2.39839131480698
2007-01-01	2.26551067403330
2008-01-01	1.97426926727647
2009-01-01	2.48103231947208
2010-01-01	2.27810392112766
2011-01-01	2.15978771262220
2012-01-01	2.26999136584435
2013-01-01	2.57559372794469