Year	Percent
1996-01-01	28.9071
1997-01-01	32.9405
1998-01-01	45.0331
1999-01-01	63.1241
2000-01-01	55.0724
2001-01-01	56.1389
2002-01-01	54.2207
2003-01-01	51.3177
2004-01-01	47.2572
2005-01-01	42.8416
2006-01-01	42.3698
2007-01-01	42.3483
2008-01-01	42.9648
2009-01-01	44.1135
2010-01-01	42.3148
2011-01-01	41.3665
2012-01-01	40.6038
2013-01-01	38.4077
2014-01-01	40.3356
2015-01-01	39.7019
2016-01-01	39.8376