Year	Percent
1999-01-01	3.26914521291340
2000-01-01	2.60592071501930
2001-01-01	2.53605787325631
2002-01-01	2.45692127744301
2003-01-01	2.97971366554324
2004-01-01	2.98780479313186
2005-01-01	2.62225665302824
2006-01-01	2.27434241246991
2007-01-01	2.09237179806543
2008-01-01	1.87211950457136
2009-01-01	2.65391006366923
2010-01-01	3.19204753208562
2011-01-01	3.68346780027402
2012-01-01	3.69729383031238
2013-01-01	3.54533439725687
2014-01-01	3.30315645665781