Year	Percent
2001-01-01	4.85080838155976
2002-01-01	5.07261836907408
2003-01-01	5.67746193720185
2004-01-01	6.52563550043590
2005-01-01	7.47581458697958
2006-01-01	7.06875937405054
2007-01-01	6.16346610325263
2008-01-01	6.23429745658930
2009-01-01	8.34686440649108
2010-01-01	8.61075269529667
2011-01-01	7.80386973474777
2012-01-01	7.97542273711952
2013-01-01	8.05290332773682
2014-01-01	7.95597229544737
2015-01-01	7.43208219087646
2016-01-01	6.99109539052504
2017-01-01	6.71870444670116