Year	Percent
1996-01-01	23.6457
1997-01-01	28.4359
1998-01-01	37.3330
1999-01-01	37.2143
2000-01-01	41.7087
2001-01-01	46.7368
2002-01-01	44.2105
2003-01-01	46.9493
2004-01-01	49.4272
2005-01-01	44.4762
2006-01-01	44.5288
2007-01-01	47.3348
2008-01-01	41.3010
2009-01-01	40.8237
2010-01-01	39.7350
2011-01-01	38.2607
2012-01-01	38.3572
2013-01-01	36.2872
2014-01-01	33.7101