Year	Percent
1991-01-01	4.67000007629395
1992-01-01	4.01200008392334
1993-01-01	4.06799983978271
1994-01-01	3.73600006103516
1995-01-01	13.41100025177000
1996-01-01	4.03999996185303
1997-01-01	4.01499986648560
1998-01-01	3.96499991416931
1999-01-01	3.92300009727478
2000-01-01	4.46000003814697
2001-01-01	4.25099992752075
2002-01-01	5.67299985885620
2003-01-01	6.64699983596802
2004-01-01	8.86800003051758
2005-01-01	11.26399993896480
2006-01-01	6.70800018310547
2007-01-01	7.76300001144409
2008-01-01	9.19900035858154
2009-01-01	8.79100036621094
2010-01-01	10.04599952697750
2011-01-01	15.23499965667720
2012-01-01	20.59399986267090
2013-01-01	21.02599906921390
2014-01-01	19.72100067138670
2015-01-01	18.45299911499020
2016-01-01	17.69199943542480
2017-01-01	15.96700000762940