observation_date	
1979-01-01	5.814130532
1979-04-01	5.814130532
1979-07-01	5.799092654
1979-10-01	5.786897381
1980-01-01	5.771441123
1980-04-01	5.752572639
1980-07-01	5.765191103
1980-10-01	5.752572639
1981-01-01	5.749392986
1981-04-01	5.739792912
1981-07-01	5.733341277
1981-10-01	5.743003188
1982-01-01	5.743003188
1982-04-01	5.749392986
1982-07-01	5.739792912
1982-10-01	5.746203191
1983-01-01	5.752572639
1983-04-01	5.749392986
1983-07-01	5.752572639
1983-10-01	5.743003188
1984-01-01	5.746203191
1984-04-01	5.743003188
1984-07-01	5.746203191
1984-10-01	5.755742214
1985-01-01	5.749392986
1985-04-01	5.777652323
1985-07-01	5.768320996
1985-10-01	5.768320996
1986-01-01	5.771441123
1986-04-01	5.793013608
1986-07-01	5.793013608
1986-10-01	5.802118375
1987-01-01	5.793013608
1987-04-01	5.793013608
1987-07-01	5.799092654
1987-10-01	5.793013608
1988-01-01	5.796057751
1988-04-01	5.783825182
1988-07-01	5.783825182
1988-10-01	5.780743516
1989-01-01	5.777652323
1989-04-01	5.774551546
1989-07-01	5.774551546
1989-10-01	5.774551546
1990-01-01	5.765191103
1990-04-01	5.765191103
1990-07-01	5.746203191
1990-10-01	5.743003188
1991-01-01	5.755742214
1991-04-01	5.743003188
1991-07-01	5.743003188
1991-10-01	5.746203191
1992-01-01	5.752572639
1992-04-01	5.746203191
1992-07-01	5.749392986
1992-10-01	5.743003188
1993-01-01	5.752572639
1993-04-01	5.758901774
1993-07-01	5.765191103
1993-10-01	5.765191103
1994-01-01	5.755742214
1994-04-01	5.758901774
1994-07-01	5.749392986
1994-10-01	5.749392986
1995-01-01	5.746203191
1995-04-01	5.749392986
1995-07-01	5.758901774
1995-10-01	5.746203191
1996-01-01	5.743003188
1996-04-01	5.743003188
1996-07-01	5.749392986
1996-10-01	5.746203191
1997-01-01	5.746203191
1997-04-01	5.749392986
1997-07-01	5.749392986
1997-10-01	5.749392986
1998-01-01	5.765191103
1998-04-01	5.765191103
1998-07-01	5.771441123
1998-10-01	5.793013608
1999-01-01	5.780743516
1999-04-01	5.796057751
1999-07-01	5.799092654
1999-10-01	5.814130532
2000-01-01	5.811140993
2000-04-01	5.811140993
2000-07-01	5.814130532
2000-10-01	5.811140993
2001-01-01	5.80814249
2001-04-01	5.81711116
2001-07-01	5.823045895
2001-10-01	5.828945618
2002-01-01	5.831882477
2002-04-01	5.826000107
2002-07-01	5.82008293
2002-10-01	5.81711116
2003-01-01	5.814130532
2003-04-01	5.823045895
2003-07-01	5.82008293
2003-10-01	5.82008293
2004-01-01	5.82008293
2004-04-01	5.831882477
2004-07-01	5.814130532
2004-10-01	5.82008293
2005-01-01	5.81711116
2005-04-01	5.811140993
2005-07-01	5.802118375
2005-10-01	5.805134969
2006-01-01	5.805134969
2006-04-01	5.796057751
2006-07-01	5.811140993
2006-10-01	5.82008293
2007-01-01	5.81711116
2007-04-01	5.814130532
2007-07-01	5.81711116
2007-10-01	5.805134969
2008-01-01	5.814130532
2008-04-01	5.814130532
2008-07-01	5.802118375
2008-10-01	5.828945618
2009-01-01	5.843544417
2009-04-01	5.843544417
2009-07-01	5.843544417
2009-10-01	5.840641657
2010-01-01	5.840641657
2010-04-01	5.834810737
2010-07-01	5.834810737
2010-10-01	5.831882477
2011-01-01	5.823045895
2011-04-01	5.81711116
2011-07-01	5.81711116
2011-10-01	5.814130532
2012-01-01	5.814130532
2012-04-01	5.82008293
2012-07-01	5.80814249
2012-10-01	5.80814249
2013-01-01	5.802118375
2013-04-01	5.814130532
2013-07-01	5.811140993
2013-10-01	5.811140993
2014-01-01	5.814130532
2014-04-01	5.799092654
2014-07-01	5.81711116
2014-10-01	5.814130532
2015-01-01	5.828945618
2015-04-01	5.826000107
2015-07-01	5.831882477
2015-10-01	5.840641657
2016-01-01	5.846438775
2016-04-01	5.846438775
2016-07-01	5.84932478
2016-10-01	5.85220248
2017-01-01	5.857933154
2017-04-01	5.869296913
