Year	Percent
1996-01-01	36.8922
1997-01-01	49.1883
1998-01-01	44.6091
1999-01-01	46.8248
2000-01-01	47.1199
2001-01-01	63.0527
2002-01-01	51.7241
2003-01-01	50.0761
2004-01-01	48.6320
2005-01-01	44.6316
2006-01-01	42.1353
2007-01-01	37.9126
2008-01-01	29.1705
2009-01-01	26.5460
2010-01-01	26.2519
2011-01-01	31.2746
2012-01-01	33.8839
2013-01-01	28.9518
2014-01-01	32.7849
2015-01-01	31.5720
2016-01-01	32.2534