Year	Percent
1991-01-01	14.0959997177124
1992-01-01	12.6820001602173
1993-01-01	13.0520000457764
1994-01-01	13.8260002136230
1995-01-01	13.3120002746582
1996-01-01	13.2829999923706
1997-01-01	12.8559999465942
1998-01-01	13.2159996032715
1999-01-01	13.3680000305176
2000-01-01	13.5989999771118
2001-01-01	13.9540004730225
2002-01-01	13.6230001449585
2003-01-01	14.3819999694824
2004-01-01	13.8889999389648
2005-01-01	12.8669996261597
2006-01-01	10.4919996261597
2007-01-01	11.8170003890991
2008-01-01	10.2290000915527
2009-01-01	11.9499998092651
2010-01-01	10.2969999313354
2011-01-01	13.2519998550415
2012-01-01	14.2740001678467
2013-01-01	16.8750000000000
2014-01-01	12.9010000228882
2015-01-01	13.5509996414185
2016-01-01	12.4010000228882
2017-01-01	12.4350004196167