Year	Percent
1998-01-01	49.7769
1999-01-01	45.9045
2000-01-01	36.0000
2001-01-01	32.9000
2002-01-01	39.3082
2003-01-01	39.4303
2004-01-01	37.9927
2005-01-01	36.5040
2006-01-01	23.0557
2007-01-01	31.6912
2008-01-01	30.5491
2009-01-01	36.8872
2010-01-01	33.9433
2011-01-01	34.1290
2012-01-01	41.1266
2013-01-01	44.3525
2014-01-01	44.2341
2015-01-01	44.4507
2016-01-01	45.9324