Year	Percent
1986-01-01	9.32546190007651
1987-01-01	9.01351931463756
1988-01-01	9.53351849776768
1989-01-01	8.81275643326207
1990-01-01	8.48864649650696
1991-01-01	13.02843691222180
1992-01-01	10.63930218974390
1993-01-01	9.37034415971456
1994-01-01	24.57101372756050
1995-01-01	13.95215894964340
1996-01-01	9.22046662376983
1997-01-01	7.96021397777458
1998-01-01	8.03166665498855
1999-01-01	6.10669589841958
2000-01-01	3.95526176649275
2001-01-01	4.93944977668384
2002-01-01	3.89570525758491
2003-01-01	6.16808644510751
2004-01-01	4.50460331603900
2005-01-01	7.84393174624716
2006-01-01	6.86126259372003
2007-01-01	7.66720678252329
2008-01-01	11.30510988270190
2009-01-01	4.84533115255270
2010-01-01	5.83942970411468
2011-01-01	7.45584781063986
2012-01-01	6.44532210536438
2013-01-01	5.50082877937354
2014-01-01	4.56617353058776
2015-01-01	4.10902219241376
2016-01-01	5.43109554184817
2017-01-01	5.25999480460541