Year	Percent
2000-01-01	5.00431183822820
2001-01-01	4.38388623743895
2002-01-01	4.50459312359937
2003-01-01	4.31886955640062
2004-01-01	4.24154161742100
2005-01-01	4.29139812192210
2006-01-01	4.94474963557866
2007-01-01	4.96079128751702
2008-01-01	5.08364281694307
2009-01-01	6.41957365095413
2010-01-01	6.87369265714572
2011-01-01	7.33935314845208
2012-01-01	7.38640606144134
2013-01-01	7.03889676341810
2014-01-01	5.82250571314286
2015-01-01	5.12538820158936
2016-01-01	4.68448696262711
2017-01-01	4.22005314247408