Year	Percent
1986-01-01	8.03748500912000
1987-01-01	8.22141651021559
1988-01-01	11.09381992874550
1989-01-01	13.86471079304280
1990-01-01	14.44820819897910
1991-01-01	19.34637005357740
1992-01-01	19.16047538602320
1993-01-01	17.87156417243670
1994-01-01	15.46844196890470
1995-01-01	12.26119533554880
1996-01-01	12.21548878391870
1997-01-01	13.58225279592540
1998-01-01	15.01688270628030
1999-01-01	14.19102744057150
2000-01-01	13.51099365115950
2001-01-01	12.10060842473960
2002-01-01	11.74389773166710
2003-01-01	10.46859865904070
2004-01-01	9.65746862198884
2005-01-01	9.75885631678045
2006-01-01	9.91900880622940
2007-01-01	9.88272881733817
2008-01-01	10.93911600955800
2009-01-01	15.87040522252410
2010-01-01	16.38879259036830
2011-01-01	15.95025013004530
2012-01-01	16.71691950809620
2013-01-01	15.04531512773440
2014-01-01	13.89432749837850
2015-01-01	13.69826495931400
2016-01-01	13.19880576799190
2017-01-01	12.67401908286240