Year	Percent
1991-01-01	6.20200014114380
1992-01-01	4.75699996948242
1993-01-01	7.31400012969971
1994-01-01	6.82399988174438
1995-01-01	7.30100011825562
1996-01-01	10.37199974060060
1997-01-01	10.94799995422360
1998-01-01	10.83100032806400
1999-01-01	11.93400001525880
2000-01-01	9.75800037384033
2001-01-01	7.79899978637695
2002-01-01	7.41800022125244
2003-01-01	8.48400020599365
2004-01-01	8.30099964141846
2005-01-01	12.90699958801270
2006-01-01	9.47900009155273
2007-01-01	9.51700019836426
2008-01-01	8.43599987030029
2009-01-01	12.87899971008300
2010-01-01	15.59399986267090
2011-01-01	20.88100051879880
2012-01-01	26.53499984741210
2013-01-01	36.97999954223630
2014-01-01	34.43899917602540
2015-01-01	31.29199981689450
2016-01-01	27.79400062561040
2017-01-01	23.82999992370610