Year	Percent
1986-01-01	1.52454996722288
1987-01-01	1.91604510558446
1988-01-01	2.74651751271780
1989-01-01	3.79149955004375
1990-01-01	4.69777876058806
1991-01-01	5.50525254994482
1992-01-01	6.86853353812050
1993-01-01	5.64994293681174
1994-01-01	4.83083225777156
1995-01-01	3.36937423272806
1996-01-01	3.69746858609662
1997-01-01	4.09020542359419
1998-01-01	4.71783373025866
1999-01-01	5.10215459363612
2000-01-01	4.75328132251324
2001-01-01	3.64278252844088
2002-01-01	3.27770011659126
2003-01-01	3.61351317464974
2004-01-01	2.48957039693777
2005-01-01	1.89320791995375
2006-01-01	2.01043993757226
2007-01-01	1.44499510582316
2008-01-01	1.98807332059225
2009-01-01	3.11061717980265
2010-01-01	3.28896610564814
2011-01-01	3.01156851911543
2012-01-01	3.77710945156070
2013-01-01	3.64012662269902
2014-01-01	2.96805524860689
2015-01-01	3.32524172195668
2016-01-01	3.15450230140799
2017-01-01	2.81028120333028