Year	Percent
1991-01-01	15.90100002288820
1992-01-01	22.18499946594240
1993-01-01	23.06599998474120
1994-01-01	23.95400047302250
1995-01-01	25.70199966430660
1996-01-01	24.16600036621090
1997-01-01	20.43099975585940
1998-01-01	21.40600013732910
1999-01-01	16.93000030517580
2000-01-01	15.19200038909910
2001-01-01	10.04199981689450
2002-01-01	19.09799957275390
2003-01-01	11.96500015258790
2004-01-01	10.15200042724610
2005-01-01	8.55900001525879
2006-01-01	8.73099994659424
2007-01-01	8.02299976348877
2008-01-01	10.20600032806400
2009-01-01	13.47900009155270
2010-01-01	12.97900009155270
2011-01-01	10.84700012207030
2012-01-01	8.25300025939941
2013-01-01	9.14799976348877
2014-01-01	8.59700012207031
2015-01-01	8.58699989318848
2016-01-01	8.59300041198730
2017-01-01	8.67899990081787