Year	Percent
1998-01-01	66.10000000000000
1999-01-01	107.80000000000000
2000-01-01	115.30000000000000
2001-01-01	123.80000000000000
2002-01-01	138.10000000000000
2003-01-01	167.10000000000000
2004-01-01	201.40000000000000
2005-01-01	242.20000000000000
2006-01-01	210.30000000000000
2007-01-01	168.90000000000000
2008-01-01	161.20000000000000
2009-01-01	173.80000000000000
2010-01-01	200.64900000000000
2011-01-01	189.62099999999998
2012-01-01	185.18099999999998
2013-01-01	147.54100000000000
2014-01-01	132.66500000000000
2015-01-01	140.48600000000000
2016-01-01	150.06200000000000