Year	Percent
1997-01-01	21.315200000000000
1998-01-01	17.656700000000000
1999-01-01	19.205700000000000
2000-01-01	17.908900000000000
2001-01-01	24.507400000000000
2002-01-01	32.298500000000000
2003-01-01	53.959300000000000
2004-01-01	42.356600000000000
2005-01-01	37.504800000000000
2006-01-01	34.049500000000000
2007-01-01	33.478700000000000
2008-01-01	35.403200000000000
2009-01-01	38.223200000000000
2010-01-01	40.478000000000000
2011-01-01	37.612800000000000
2012-01-01	34.163400000000000
2013-01-01	32.591300000000000
2014-01-01	31.656999999999996