Year	Percent
1996-01-01	28.5454
1997-01-01	28.2694
1998-01-01	31.5574
1999-01-01	43.5692
2000-01-01	33.6341
2001-01-01	33.5114
2002-01-01	35.3760
2003-01-01	35.4134
2004-01-01	39.8660
2005-01-01	44.2483
2006-01-01	53.2030
2007-01-01	52.6381
2008-01-01	52.2397
2009-01-01	56.3926
2010-01-01	49.6166
2011-01-01	47.9685
2012-01-01	41.0435
2013-01-01	38.5769
2014-01-01	44.3655
2015-01-01	39.5148
2016-01-01	39.8286