Year	Ratio
1970-01-01	1.130669951438900
1971-01-01	1.144500017166140
1972-01-01	1.163140058517460
1973-01-01	1.190189957618710
1974-01-01	1.205369949340820
1975-01-01	1.225999951362610
1976-01-01	1.232370018959050
1977-01-01	1.233049988746640
1978-01-01	1.236739993095400
1979-01-01	1.230039954185490
1980-01-01	1.206949949264530
1981-01-01	1.179389953613280
1982-01-01	1.149919986724850
1983-01-01	1.148390054702760
1984-01-01	1.125380039215090
1985-01-01	1.107769966125490
1986-01-01	1.081959962844850
1987-01-01	1.077219963073730
1988-01-01	1.076460003852840
1989-01-01	1.069589972496030
1990-01-01	1.074540019035340
1991-01-01	1.066140055656430
1992-01-01	1.054819941520690
1993-01-01	1.036280035972600
1994-01-01	1.026530027389530
1995-01-01	1.013870000839230
1996-01-01	1.007990002632140
1997-01-01	1.006029963493350
1998-01-01	0.995819985866547
1999-01-01	1.000229954719540
2000-01-01	0.998780012130737
2001-01-01	0.997160017490387
2002-01-01	0.989989995956421
2003-01-01	0.990819990634918
2004-01-01	0.983479976654053
2005-01-01	0.984920024871826
2006-01-01	0.977590024471283
2007-01-01	0.971199989318848
2008-01-01	0.971610009670258
2009-01-01	0.963970005512238
2012-01-01	0.972980022430420
2013-01-01	0.967260003089905
2014-01-01	0.965849995613098