Year	Ratio
1996-01-01	96.9842441228544
1997-01-01	90.5079095480196
1998-01-01	73.4280187218556
1999-01-01	50.2112919897233
2000-01-01	65.3262787675308
2001-01-01	85.4062709370627
2002-01-01	85.1960222918710
2003-01-01	74.0400943303207
2004-01-01	65.7769591090702
2005-01-01	65.9359627659724
2006-01-01	56.5503497251933
2007-01-01	52.4179896903655
2008-01-01	81.3070040085042
2009-01-01	78.4493141908829
2010-01-01	73.4723273280414
2011-01-01	79.7752903978606
2012-01-01	85.9534984934031
2013-01-01	79.6155528411608
2014-01-01	89.9902132133320
2015-01-01	86.0144021263160
2016-01-01	91.8601193199640
2017-01-01	89.0761554027924