Year	Percent
1996-01-01	61.7754
1997-01-01	61.8860
1998-01-01	59.7805
1999-01-01	58.1316
2000-01-01	48.3664
2001-01-01	43.9684
2002-01-01	38.6498
2003-01-01	30.3053
2004-01-01	25.3180
2005-01-01	25.9331
2006-01-01	26.8223
2007-01-01	23.2720
2008-01-01	21.0926
2009-01-01	21.4823
2010-01-01	21.3768
2011-01-01	23.4527
2012-01-01	24.1307
2013-01-01	26.3223
2014-01-01	41.4374
2015-01-01	40.0356
2016-01-01	35.3999