Year	Ratio
1973-01-01	1.449640035629270
1974-01-01	1.710590004920960
1975-01-01	1.776530027389530
1976-01-01	1.519180059432980
1977-01-01	1.600659966468810
1978-01-01	1.531579971313480
1979-01-01	1.504729986190800
1986-01-01	1.255570054054260
1987-01-01	1.305580019950870
1990-01-01	1.203459978103640
1999-01-01	1.328799962997440
2000-01-01	1.128780007362370
2001-01-01	1.094630002975460
2002-01-01	1.125900030136110
2003-01-01	1.128620028495790
2004-01-01	1.089660048484800
2005-01-01	1.081869959831240
2006-01-01	1.072700023651120
2007-01-01	1.086079955101010
2008-01-01	1.043269991874690
2009-01-01	1.116299986839290
2010-01-01	1.092489957809450
2011-01-01	1.070829987525940
2014-01-01	0.980870008468628
2015-01-01	0.986159980297089