Year	Percent
1992-01-01	5.597562136635590
1993-01-01	14.411270894024200
1994-01-01	12.144799661052500
1995-01-01	8.962517415654120
1996-01-01	8.194548902041710
1997-01-01	5.536006783999030
1998-01-01	4.644214226607820
1999-01-01	2.364818361118060
2000-01-01	3.775388291517330
2001-01-01	4.262872288737030
2002-01-01	2.786159885894950
2003-01-01	2.348641695827550
2004-01-01	2.829478387765960
2005-01-01	2.608461540723310
2006-01-01	3.192884922451730
2007-01-01	2.915982618728540
2008-01-01	6.059740463397060
2009-01-01	1.508080394134840
2010-01-01	2.400082378781300
2011-01-01	3.788002239937760
2012-01-01	2.787079581559300
2013-01-01	1.733619742511360
2014-01-01	0.592255588590948
2015-01-01	0.204336094071738
2016-01-01	0.372761398893792
2017-01-01	1.875100595525480