Year	Ratio
1977-01-01	0.363240003585815
1978-01-01	0.373479992151260
1979-01-01	0.384570002555847
1980-01-01	0.405640006065369
1981-01-01	0.430700004100800
1982-01-01	0.454089999198914
1983-01-01	0.481779992580414
1984-01-01	0.495260000228882
1985-01-01	0.477109998464584
1986-01-01	0.482740014791489
1987-01-01	0.484100013971329
1988-01-01	0.476110011339188
1989-01-01	0.495460003614426
1990-01-01	0.527970016002655
1991-01-01	0.540629982948303
1992-01-01	0.551150023937225
1993-01-01	0.568790018558502
1994-01-01	0.585910022258759
1995-01-01	0.596970021724701
1996-01-01	0.606329977512360
1998-01-01	0.701200008392334
1999-01-01	0.721249997615814
2000-01-01	0.750699996948242
2001-01-01	0.754980027675629
2002-01-01	0.775229990482330
2003-01-01	0.807160019874573
2004-01-01	0.830290019512177
2005-01-01	0.866569995880127
2006-01-01	0.897520005702972
2007-01-01	0.924409985542297
2008-01-01	0.991310000419617
2009-01-01	1.007740020751950
2010-01-01	0.989730000495911
2011-01-01	0.991750001907349
2012-01-01	0.998969972133636
2013-01-01	1.012199997901920
2014-01-01	1.016510009765630
2015-01-01	1.028599977493290
2016-01-01	1.020009994506840