Year	Percent
1987-01-01	9.87469609126636
1988-01-01	7.41276595744663
1989-01-01	6.04547975596240
1990-01-01	6.12671846981461
1991-01-01	6.35736412278236
1992-01-01	3.63407691798491
1993-01-01	3.01481859989799
1994-01-01	5.31374007936500
1995-01-01	10.29781179472050
1996-01-01	2.37712902953223
1997-01-01	5.30560105668805
1998-01-01	8.40223795613228
1999-01-01	6.10669589841958
2000-01-01	2.20825620937533
2001-01-01	2.00717374213844
2002-01-01	3.33256493271908
2003-01-01	5.66870773441478
2004-01-01	7.58753638504689
2005-01-01	7.04661816222038
2006-01-01	6.76526117054758
2007-01-01	9.10698496905383
2008-01-01	8.90194489465155
2009-01-01	5.42347236174680
2010-01-01	8.12667639169919
2011-01-01	11.33291519683600
2012-01-01	6.21818236968360
2013-01-01	7.52997282337094
2014-01-01	6.99116532700683
2015-01-01	6.19428022984985
2016-01-01	5.43093776295698
2017-01-01	5.78487050920603