Year	Percent
1981-01-01	11.81469755002120
1982-01-01	9.82116244432080
1983-01-01	13.50251051701790
1984-01-01	20.02630320423250
1985-01-01	10.51897599371660
1986-01-01	14.04686795876440
1987-01-01	25.15509542829110
1988-01-01	33.91216493543390
1989-01-01	12.44636205026640
1990-01-01	11.82353804541510
1991-01-01	12.61531538288490
1992-01-01	23.75135302303980
1993-01-01	22.77271023366250
1994-01-01	34.64963615083230
1995-01-01	83.32577475434590
1996-01-01	37.60204502350160
1997-01-01	9.13735243003495
1998-01-01	29.74865128282630
1999-01-01	44.80416428616740
2000-01-01	29.58148846316840
2001-01-01	22.70000000000000
2002-01-01	14.74463461016030
2003-01-01	9.57679786919213
2004-01-01	11.42980608221240
2005-01-01	15.41034466042960
2006-01-01	13.97429435483880
2007-01-01	7.95220990864032
2008-01-01	8.71260186609040
2009-01-01	8.42204427696655
2010-01-01	7.41159092883827
2011-01-01	7.62282262848512
2012-01-01	21.27126500137800
2013-01-01	27.28333333333330
2014-01-01	23.79206494696870
2015-01-01	21.86734755425530
2016-01-01	21.71111321364990
2017-01-01	12.17842434615180