Year	Percent
1999-01-01	2.05952093658066
2000-01-01	1.85691255792288
2001-01-01	1.92220789391520
2002-01-01	2.24267780962621
2003-01-01	2.45033130476342
2004-01-01	2.51203660114134
2005-01-01	2.73701462680850
2006-01-01	2.44941358369028
2007-01-01	2.25190045590466
2008-01-01	2.04523953473188
2009-01-01	2.84564672657016
2010-01-01	2.60462793534430
2011-01-01	2.30028315406174
2012-01-01	2.49623667103840
2013-01-01	2.81237226773734