Year	Percent
1992-01-01	21.3968
1993-01-01	27.0343
1994-01-01	15.4658
1995-01-01	17.6243
1996-01-01	16.6189
1997-01-01	12.7251
1998-01-01	18.6227
1999-01-01	11.9247
2000-01-01	16.4591
2001-01-01	17.2209
2002-01-01	16.5402
2003-01-01	15.4647
2004-01-01	15.8673
2005-01-01	15.8080
2006-01-01	15.1176
2007-01-01	13.7185
2008-01-01	14.4828
2009-01-01	14.2486
2010-01-01	13.3054
2011-01-01	12.0327
2012-01-01	11.5285
2013-01-01	10.0335
2014-01-01	10.7387
2015-01-01	11.3319
2016-01-01	10.9878
2017-01-01	10.0532