Year	Percent
1996-01-01	47.5277
1997-01-01	62.2530
1998-01-01	44.3888
1999-01-01	53.3212
2000-01-01	51.0355
2001-01-01	41.6363
2002-01-01	40.9576
2003-01-01	38.4089
2004-01-01	37.9516
2005-01-01	45.6462
2006-01-01	49.5509
2007-01-01	48.3053
2008-01-01	66.7410
2009-01-01	54.5745
2010-01-01	56.6615
2011-01-01	55.7169
2012-01-01	51.6117
2013-01-01	47.4680
2014-01-01	50.6316
2015-01-01	46.1382
2016-01-01	55.9009