Year	Percent
1998-01-01	43.2819
1999-01-01	41.0295
2000-01-01	41.7000
2001-01-01	43.3000
2002-01-01	40.9989
2003-01-01	40.5525
2004-01-01	32.0981
2005-01-01	28.7435
2006-01-01	30.6757
2007-01-01	31.7847
2008-01-01	36.1160
2009-01-01	36.2202
2010-01-01	35.8226
2011-01-01	38.3388
2012-01-01	36.4544
2013-01-01	36.2576
2014-01-01	42.8686