Year	Percent
1998-01-01	34.27440000000000
1999-01-01	38.34340000000000
2000-01-01	44.90000000000000
2001-01-01	47.90000000000000
2002-01-01	44.79370000000000
2003-01-01	50.87390000000000
2004-01-01	52.74170000000000
2005-01-01	51.22880000000000
2006-01-01	60.80520000000000
2007-01-01	59.44370000000000
2008-01-01	50.38680000000000
2009-01-01	44.48500000000000
2010-01-01	49.66010000000000
2011-01-01	52.28920000000000
2012-01-01	61.35140000000000
2013-01-01	57.15180000000000
2014-01-01	73.69800000000001
2015-01-01	72.58070000000000
2016-01-01	60.24300000000000