Year	Percent
1996-12-31	5.8675
1997-12-31	6.4896
1998-12-31	7.1026
1999-12-31	5.1518
2000-12-31	5.8027
2001-12-31	4.9545
2002-12-31	3.824
2003-12-31	3.5448
2004-12-31	4.3269
2005-12-31	4.6201
2006-12-31	4.6408
2007-12-31	5.5431
2008-12-31	4.6311
2009-12-31	0.6065
2010-12-31	0.5151
2011-12-31	0.5105
2012-12-31	0.4529
2013-12-31	0.4406
2014-12-31	0.4457
2015-12-31	0.5028
2016-12-31	0.4109
2017-12-31	0.2696