Year	Percent
1996-01-01	56.1508
1997-01-01	57.5168
1998-01-01	62.5037
1999-01-01	48.5766
2000-01-01	45.3729
2001-01-01	41.5458
2002-01-01	44.2284
2003-01-01	38.5849
2004-01-01	40.3918
2005-01-01	39.3739
2006-01-01	35.6649
2007-01-01	44.5652
2008-01-01	43.7343
2009-01-01	46.4431
2010-01-01	54.0785
2011-01-01	71.1471
2012-01-01	52.7694
2013-01-01	49.3309
2014-01-01	51.0996