Year	Percent
1999-01-01	3.82833453463197
2000-01-01	3.45717215947311
2001-01-01	3.06622405396943
2002-01-01	3.17421149352475
2003-01-01	3.39043685530198
2004-01-01	3.26609800059403
2005-01-01	3.39737440713427
2006-01-01	2.73754358254754
2007-01-01	2.24795265799377
2008-01-01	2.24326704974743
2009-01-01	3.30312222143878
2010-01-01	4.13297881753547
2011-01-01	4.43105361350053
2012-01-01	4.50068217945295
2013-01-01	5.04476372425248
2014-01-01	4.78630603162649