Year	Percent
1991-01-01	4.69199991226196
1992-01-01	6.54699993133545
1993-01-01	8.39000034332275
1994-01-01	8.66199970245361
1995-01-01	7.76499986648560
1996-01-01	7.18200016021729
1997-01-01	6.94000005722046
1998-01-01	10.75800037384030
1999-01-01	16.51000022888180
2000-01-01	16.86700057983400
2001-01-01	16.16500091552730
2002-01-01	15.26299953460690
2003-01-01	16.67700004577640
2004-01-01	19.82900047302250
2005-01-01	19.26399993896480
2006-01-01	17.55100059509280
2007-01-01	10.77400016784670
2008-01-01	9.87699985504150
2009-01-01	16.67000007629390
2010-01-01	18.35600090026860
2011-01-01	18.04100036621090
2012-01-01	19.50799942016600
2013-01-01	18.96899986267090
2014-01-01	15.86100006103520
2015-01-01	12.60700035095210
2016-01-01	10.49800014495850
2017-01-01	7.96700000762939