Year	Percent
1993-01-01	36.4231
1994-01-01	37.0113
1995-01-01	31.5068
1996-01-01	23.9967
1997-01-01	25.8711
1998-01-01	21.6317
1999-01-01	18.2934
2000-01-01	17.3116
2001-01-01	16.6150
2002-01-01	16.3960
2003-01-01	16.7709
2004-01-01	18.7382
2005-01-01	21.0121
2006-01-01	24.6434
2007-01-01	29.3166
2008-01-01	36.9323
2009-01-01	42.1488
2010-01-01	42.4369
2011-01-01	43.5853
2012-01-01	46.0789
2013-01-01	45.2044
2014-01-01	46.1807
2015-01-01	47.8588
2016-01-01	46.9575