Year	Ratio
1970-01-01	1.18587
1971-01-01	1.18155
1972-01-01	1.18651
1973-01-01	1.19449
1974-01-01	1.20135
1975-01-01	1.21223
1976-01-01	1.22176
1977-01-01	1.24215
1978-01-01	1.25916
1979-01-01	1.27921
1980-01-01	1.29186
1981-01-01	1.29941
1982-01-01	1.30875
1983-01-01	1.32235
1984-01-01	1.33565
1985-01-01	1.35127
1986-01-01	1.37322
1987-01-01	1.34932
1988-01-01	1.32486
1989-01-01	1.29917
1990-01-01	1.26884
1991-01-01	1.24050
1992-01-01	1.22985
1993-01-01	1.23525
1994-01-01	1.23139
1995-01-01	1.23399
1996-01-01	1.23873
1997-01-01	1.26239
1998-01-01	1.28890
1999-01-01	1.30324
2000-01-01	1.31394
2001-01-01	1.31419
2002-01-01	1.36152
2003-01-01	1.32784
2004-01-01	1.38468
2005-01-01	1.38261
2006-01-01	1.37589
2007-01-01	1.39031
2008-01-01	1.40298
2009-01-01	1.40832
2010-01-01	1.39851
2011-01-01	1.38467
2012-01-01	1.32910
2013-01-01	1.29277