Year	Percent
1996-01-01	41.7275
1997-01-01	46.2863
1998-01-01	46.1546
1999-01-01	48.3557
2000-01-01	33.2757
2001-01-01	33.4056
2002-01-01	33.0368
2003-01-01	29.0843
2004-01-01	22.8515
2005-01-01	21.8794
2006-01-01	23.3101
2007-01-01	22.6793
2008-01-01	26.8147
2009-01-01	21.5976
2010-01-01	24.9485
2011-01-01	28.2432
2012-01-01	26.2539
2013-01-01	20.5886
2014-01-01	29.7919
2015-01-01	31.0527
2016-01-01	36.2449