Year	Percent
1991-01-01	5.32200002670288
1992-01-01	5.28100013732910
1993-01-01	5.24599981307983
1994-01-01	6.93900012969971
1995-01-01	11.09799957275390
1996-01-01	9.02700042724609
1997-01-01	7.18599987030029
1998-01-01	6.30800008773804
1999-01-01	4.01599979400635
2000-01-01	4.98600006103516
2001-01-01	4.75500011444092
2002-01-01	5.81799983978271
2003-01-01	6.07399988174438
2004-01-01	7.52199983596802
2005-01-01	6.85400009155273
2006-01-01	6.96500015258789
2007-01-01	7.12900018692017
2008-01-01	7.62099981307983
2009-01-01	10.03199958801270
2010-01-01	9.73799991607666
2011-01-01	9.80300045013428
2012-01-01	9.40100002288818
2013-01-01	9.43099975585938
2014-01-01	9.42300033569336
2015-01-01	8.56200027465820
2016-01-01	7.66400003433228
2017-01-01	6.82700014114380