Year	Percent
1991-01-01	1.628000020980830
1992-01-01	1.588999986648560
1993-01-01	1.570000052452090
1994-01-01	1.636000037193300
1995-01-01	1.625000000000000
1996-01-01	1.616999983787540
1997-01-01	5.758999824523930
1998-01-01	11.809000015258800
1999-01-01	7.222000122070310
2000-01-01	4.660999774932860
2001-01-01	3.309999942779540
2002-01-01	3.573999881744380
2003-01-01	3.624000072479250
2004-01-01	4.025000095367430
2005-01-01	3.433000087738040
2006-01-01	2.839999914169310
2007-01-01	1.531000018119810
2008-01-01	0.792999982833862
2009-01-01	0.351000010967255
2010-01-01	0.549000024795532
2011-01-01	0.381000012159348
2012-01-01	0.305999994277954
2013-01-01	0.574000000953674
2014-01-01	0.344999998807907
2015-01-01	0.345999985933304
2016-01-01	0.381999999284744
2017-01-01	0.418999999761581