Year	Percent
1990-01-01	51.1721000000000000
1991-01-01	54.8214000000000000
1992-01-01	52.1889000000000000
1993-01-01	52.1502000000000000
1994-01-01	54.1765000000000000
1995-01-01	52.9665000000000000
1996-01-01	52.2359000000000000
1997-01-01	48.1741000000000000
1998-01-01	45.5594000000000000
1999-01-01	44.1765000000000000
2000-01-01	39.2285000000000000
2001-01-01	3.2497500000000000
2002-01-01	3.3772800000000003
2003-01-01	2.1696800000000000
2004-01-01	2.4888200000000000
2005-01-01	2.0516600000000000
2006-01-01	2.3071599999999997
2007-01-01	3.0315100000000000
2008-01-01	10.4585000000000000
2009-01-01	15.0088000000000000
2010-01-01	49.5372000000000000
2011-01-01	45.5545000000000000
2012-01-01	49.8353000000000000
2013-01-01	47.8600000000000000
2014-01-01	42.9632000000000000
2015-01-01	49.2947000000000000
2016-01-01	48.2048000000000000