Year	Percent
1999-01-01	10.99486400521640
2000-01-01	9.60693180643348
2001-01-01	7.54312036736089
2002-01-01	8.29815087602526
2003-01-01	8.49934440860274
2004-01-01	8.26138542728962
2005-01-01	7.13544769234961
2006-01-01	6.35137869088660
2007-01-01	6.40884382129126
2008-01-01	10.05166401716150
2009-01-01	17.64724598701650
2010-01-01	19.56742855132020
2011-01-01	21.04426799955170
2012-01-01	24.58175409721810
2013-01-01	25.59850448612550
2014-01-01	23.60187688688200
2015-01-01	20.77278674840370
2016-01-01	18.11833013446310
2017-01-01	15.65924095303030