Year	Ratio
1971-01-01	0.587019979953766
1972-01-01	0.603209972381592
1973-01-01	0.658240020275116
1974-01-01	0.690760016441345
1975-01-01	0.720390021800995
1978-01-01	0.760490000247955
1979-01-01	0.747520029544830
1980-01-01	0.777159988880157
1981-01-01	0.830410003662109
1982-01-01	0.833289980888367
1983-01-01	0.865270018577576
1984-01-01	0.884270012378693
1985-01-01	0.866800010204315
1986-01-01	0.881120026111603
1987-01-01	0.926919996738434
1988-01-01	0.940199971199036
1989-01-01	0.910889983177185
1990-01-01	0.966130018234253
1991-01-01	0.975499987602234
1993-01-01	0.999109983444214
1994-01-01	1.016080021858220
1995-01-01	1.018589973449710
1996-01-01	1.039319992065430
1999-01-01	1.166960000991820
2000-01-01	1.148550033569340
2001-01-01	1.175760030746460
2002-01-01	1.186830043792720
2003-01-01	1.196869969367980
2004-01-01	1.217139959335330
2005-01-01	1.245300054550170
2006-01-01	1.258610010147090
2007-01-01	1.265249967575070
2008-01-01	1.264629960060120
2009-01-01	1.248909950256350
2010-01-01	1.266280055046080
2011-01-01	1.271149992942810
2012-01-01	1.282480001449580
2013-01-01	1.295050024986270
2014-01-01	1.303339958190920
2015-01-01	1.307209968566890