Year	Ratio
1971-01-01	0.421880006790161
1972-01-01	0.428900003433228
1973-01-01	0.438210010528564
1975-01-01	0.461739987134933
1976-01-01	0.465229988098145
1977-01-01	0.471949994564056
1978-01-01	0.478949993848801
1980-01-01	0.487480014562607
1981-01-01	0.501609981060028
1982-01-01	0.497570008039474
1983-01-01	0.553780019283295
1984-01-01	0.515869975090027
1986-01-01	0.538330018520355
1987-01-01	0.543519973754883
1988-01-01	0.556169986724854
1989-01-01	0.570060014724731
1993-01-01	0.623610019683838
1994-01-01	0.639750003814697
1995-01-01	0.639119982719421
1996-01-01	0.644590020179749
1997-01-01	0.664969980716705
1999-01-01	0.699890017509460
2000-01-01	0.707480013370514
2001-01-01	0.714100003242493
2002-01-01	0.741659998893738
2003-01-01	0.803889989852905
2004-01-01	0.806710004806519
2005-01-01	0.823689997196198
2006-01-01	0.836239993572235
2007-01-01	0.862399995326996
2008-01-01	0.886759996414185
2009-01-01	0.922659993171692
2010-01-01	0.929250001907349
2011-01-01	0.944149971008301
2012-01-01	0.951979994773865
2013-01-01	1.009289979934690
2014-01-01	1.013339996337890
2015-01-01	1.012459993362430
2016-01-01	1.016589999198910