Year	Percent
2000-01-01	3.75414206862831
2001-01-01	2.81833934628156
2002-01-01	3.13155663245317
2003-01-01	3.88963703472684
2004-01-01	4.84391946937910
2005-01-01	5.06781979411868
2006-01-01	4.36164308622097
2007-01-01	3.63743583316059
2008-01-01	3.00900781370293
2009-01-01	3.46405171909245
2010-01-01	4.51203353485646
2011-01-01	5.41283002835631
2012-01-01	6.22915076833786
2013-01-01	7.30186284986228
2014-01-01	7.74632674109966
2015-01-01	7.27414309383394
2016-01-01	6.50933654401053
2017-01-01	5.25705841410520