Year	Percent
1998-01-01	55.0618
1999-01-01	41.3350
2000-01-01	39.1000
2001-01-01	43.6000
2002-01-01	44.0409
2003-01-01	47.3050
2004-01-01	50.4255
2005-01-01	61.6234
2006-01-01	61.6847
2007-01-01	68.4938
2008-01-01	66.8190
2009-01-01	66.3471
2010-01-01	67.9939
2011-01-01	64.8338
2012-01-01	62.3231
2013-01-01	62.3231
2014-01-01	67.3622
2015-01-01	71.1702
2016-01-01	67.1569