Year	Percent
1998-01-01	76.47060
1999-01-01	51.40850
2000-01-01	57.66420
2001-01-01	28.87320
2002-01-01	39.18920
2003-01-01	41.05960
2004-01-01	38.98310
2005-01-01	48.90970
2006-01-01	46.48190
2007-01-01	37.59540
2008-01-01	36.11530
2009-01-01	26.17990
2010-01-01	28.26460
2011-01-01	24.40400
2012-01-01	19.33330
2013-01-01	8.62449
2014-01-01	13.21990