Year	Percent
1996-01-01	52.6291
1997-01-01	45.5811
1998-01-01	32.2067
1999-01-01	37.5367
2000-01-01	42.6577
2001-01-01	41.5549
2002-01-01	40.5416
2003-01-01	40.1626
2004-01-01	43.9791
2005-01-01	36.5129
2006-01-01	32.1299
2007-01-01	31.3241
2008-01-01	24.0696
2009-01-01	29.1290
2010-01-01	36.7754
2011-01-01	37.4471
2012-01-01	38.3606
2013-01-01	43.5280
2014-01-01	44.5257
2015-01-01	40.6313
2016-01-01	36.6146