Year	Percent
1996-01-01	15.12490
1997-01-01	12.17820
1998-01-01	6.35668
1999-01-01	7.33864
2000-01-01	8.51798
2001-01-01	8.89203
2002-01-01	8.41840
2003-01-01	11.91870
2004-01-01	13.10280
2005-01-01	13.82250
2006-01-01	17.54490
2007-01-01	15.36060
2008-01-01	12.42120
2009-01-01	23.77690
2010-01-01	21.77510
2011-01-01	25.12710
2012-01-01	23.55410
2013-01-01	20.47310
2014-01-01	20.92760
2015-01-01	26.76630
2016-01-01	21.99680