Year	Percent
1997-01-01	100.00000000000000
1998-01-01	100.00000000000000
1999-01-01	100.00000000000000
2000-01-01	70.43180000000000
2001-01-01	62.97460000000000
2002-01-01	67.00230000000000
2003-01-01	68.19440000000000
2004-01-01	66.73100000000001
2005-01-01	67.82460000000000
2006-01-01	70.54070000000000
2007-01-01	69.98510000000000
2008-01-01	71.70370000000000
2009-01-01	72.51340000000000
2010-01-01	72.87080000000000
2011-01-01	73.86900000000000
2012-01-01	69.15030000000000
2013-01-01	70.27700000000000
2014-01-01	73.25720000000000
2015-01-01	73.78900000000000
2016-01-01	79.54280000000000