Year	Percent
1993-01-01	2.94
1994-01-01	3.79
1995-01-01	3.20
1996-01-01	4.26
1997-01-01	6.29
1998-01-01	12.43
1999-01-01	14.16
2000-01-01	11.36
2001-01-01	12.67
2002-01-01	15.91
2003-01-01	23.12
2004-01-01	28.75
2005-01-01	36.35
2006-01-01	37.95
2007-01-01	51.08
2008-01-01	13.67
2009-01-01	12.25
2010-01-01	17.54
2011-01-01	18.50
2012-01-01	19.09
2013-01-01	19.38
2014-01-01	18.67
2015-01-01	20.81
2016-01-01	21.39