Year	Percent
1991-01-01	0.1882080000000000
1992-01-01	0.2311320000000000
1993-01-01	1.1095500000000000
1994-01-01	1.6824800000000000
1995-01-01	1.7531100000000000
1996-01-01	1.6992000000000000
1997-01-01	2.4859700000000000
1998-01-01	2.4491800000000000
1999-01-01	1.8903700000000000
2000-01-01	1.4517200000000001
2001-01-01	1.7999900000000002
2002-01-01	1.6824200000000000
2003-01-01	1.4372400000000000
2004-01-01	1.7100700000000000
2005-01-01	1.9603700000000002
2006-01-01	2.0607100000000000
2007-01-01	3.4401800000000002
2008-01-01	4.1097000000000000
2009-01-01	3.5766400000000003
2010-01-01	3.5742900000000000
2011-01-01	3.9235900000000004
2012-01-01	3.3819400000000000
2013-01-01	2.5234000000000000
2014-01-01	3.1096500000000000
2015-01-01	3.7711699999999997
2016-01-01	3.2047500000000000
2017-01-01	2.9542400000000000