Year	Ratio
1976-01-01	1.06167995929718
1981-01-01	1.10272002220154
1982-01-01	1.11333000659943
1983-01-01	1.10711002349854
1984-01-01	1.10907995700836
1985-01-01	1.10755002498627
1986-01-01	1.11529004573822
1987-01-01	1.08973002433777
1988-01-01	1.08501994609833
1989-01-01	1.08080995082855
1990-01-01	1.08103001117706
1991-01-01	1.09221994876862
1992-01-01	1.08735001087189
1993-01-01	1.08484005928040
1994-01-01	1.09695005416870
1995-01-01	1.08156001567841
2010-01-01	1.01251995563507
2011-01-01	1.01994001865387
2012-01-01	1.04701995849609
2013-01-01	1.04602003097534
2016-01-01	1.03436005115509