Year	Percent
1997-01-01	0.19524300000000
1998-01-01	0.16974500000000
1999-01-01	36.39540000000000
2000-01-01	40.99410000000000
2001-01-01	41.11940000000000
2002-01-01	45.25980000000000
2003-01-01	41.89690000000000
2004-01-01	46.24420000000000
2005-01-01	45.62390000000000
2006-01-01	61.94630000000000
2007-01-01	76.22980000000000
2008-01-01	58.23250000000000
2009-01-01	65.01100000000001
2010-01-01	51.69990000000000
2011-01-01	39.96150000000000
2012-01-01	45.52010000000000
2013-01-01	44.76270000000000
2014-01-01	40.39380000000000
2015-01-01	42.00500000000000
2016-01-01	38.68100000000000