Year	Percent
1986-01-01	7.91779659529845
1987-01-01	8.67453356518353
1988-01-01	12.00615596408930
1989-01-01	14.61699014641030
1990-01-01	15.31953574870050
1991-01-01	21.30477489132860
1992-01-01	21.20599602385280
1993-01-01	19.20546819716340
1994-01-01	16.07972826694360
1995-01-01	12.34701588542730
1996-01-01	12.81579081398450
1997-01-01	13.78470382965130
1998-01-01	16.09160373942400
1999-01-01	15.24835270750780
2000-01-01	14.53957540573990
2001-01-01	12.32202932430050
2002-01-01	11.83966142117010
2003-01-01	10.31709327130620
2004-01-01	8.92840651472595
2005-01-01	9.37264843264122
2006-01-01	9.46686347022347
2007-01-01	9.90910184871181
2008-01-01	11.30284037958070
2009-01-01	15.49742257742830
2010-01-01	16.08279179420610
2011-01-01	16.88708258835260
2012-01-01	16.78249027932780
2013-01-01	14.73152452130920
2014-01-01	13.29711094799810
2015-01-01	13.70782314654370
2016-01-01	13.04347522950190
2017-01-01	12.37712348674710