Quarter	Percent
1978-04-01	82.3898448000000
1978-07-01	81.5850799000000
1978-10-01	81.9717684666666
1979-01-01	82.0190926333333
1979-04-01	82.0646218333333
1979-07-01	81.9981888666667
1979-10-01	82.3451823333334
1980-01-01	82.1938081000000
1980-04-01	82.1370977000000
1980-07-01	82.1617934333334
1980-10-01	82.5398197000000
1981-01-01	82.5851287666667
1981-04-01	82.5868951333333
1981-07-01	82.2471685333334
1981-10-01	81.8767922000000
1982-01-01	81.7484593666667
1982-04-01	81.0259757000000
1982-07-01	80.1814252666667
1982-10-01	79.0713908666667
1983-01-01	77.3400107000000
1983-04-01	76.6643079000000
1983-07-01	76.5550747666666
1983-10-01	77.1450067000000
1984-01-01	77.1515817666667
1984-04-01	77.5363682000000
1984-07-01	77.4202588666666
1984-10-01	77.5110597666666
1985-01-01	77.2285609000000
1985-04-01	77.1728143666667
1985-07-01	77.7128051000000
1985-10-01	78.5222320000000
1986-01-01	78.3433999333333
1986-04-01	78.5320149000000
1986-07-01	77.9459368666667
1986-10-01	78.0452986666667
1987-01-01	77.6107278333334
1987-04-01	77.7408886666666
1987-07-01	77.7487492666666
1987-10-01	77.8151818666666
1988-01-01	78.2674950666666
1988-04-01	78.4967141666666
1988-07-01	78.3727143333333
1988-10-01	79.1104523666666
1989-01-01	79.0419471333334
1989-04-01	79.7988510666666
1989-07-01	79.9628847000000
1989-10-01	80.4172807333333
1990-01-01	79.5522473666666
1990-04-01	79.6533024000000
1990-07-01	79.1278183000000
1990-10-01	78.5159593666666
1991-01-01	76.7925508333334
1991-04-01	76.0061433000000
1991-07-01	75.0269036333333
1991-10-01	75.1974763666666
1992-01-01	74.3804895000000
1992-04-01	74.2725685000000
1992-07-01	74.1168830000000
1992-10-01	73.8720797666666
1993-01-01	73.3991779666667
1993-04-01	73.3726557333333
1993-07-01	73.6148922666667
1993-10-01	74.4122576666666
1994-01-01	74.1151602666667
1994-04-01	74.7400742666667
1994-07-01	75.3740044000000
1994-10-01	75.9919224333333
1995-01-01	75.9411723000000
1995-04-01	76.2888826000000
1995-07-01	76.4990220666667
1995-10-01	76.8101972666666
1996-01-01	76.1853318666666
1996-04-01	76.2983434666667
1996-07-01	76.3120561000000
1996-10-01	76.4190759666667
1997-01-01	75.7637576666667
1997-04-01	75.7136215000000
1997-07-01	75.5500011000000
1997-10-01	76.3560687333333
1998-01-01	75.9225996333333
1998-04-01	76.0808452666666
1998-07-01	76.0763182666667
1998-10-01	76.6026066000000
1999-01-01	76.2608384000000
1999-04-01	76.4808458333333
1999-07-01	76.6568694000000
1999-10-01	76.9966690666667
2000-01-01	76.4062725000000
2000-04-01	76.9568045000000
2000-07-01	77.2367770333333
2000-10-01	77.0983085333334
2001-01-01	76.1237398333333
2001-04-01	76.3393045000000
2001-07-01	76.4172763666667
2001-10-01	76.5515097000000
2002-01-01	76.2153421000000
2002-04-01	76.6043402333333
2002-07-01	76.7176717666667
2002-10-01	77.2209264000000
2003-01-01	76.9965077666666
2003-04-01	76.6254003000000
2003-07-01	76.8775784666666
2003-10-01	77.7206769000000
2004-01-01	77.3998699666666
2004-04-01	77.5405058000000
2004-07-01	77.3855373000000
2004-10-01	78.0944363666667
2005-01-01	78.1329884666667
2005-04-01	78.6106479333333
2005-07-01	78.6287868666666
2005-10-01	78.6503966000000
2006-01-01	78.2793407000000
2006-04-01	78.5808787333333
2006-07-01	79.0452360333333
2006-10-01	79.3337308666667
2007-01-01	79.0584413666667
2007-04-01	79.6090992666666
2007-07-01	79.6745249000000
2007-10-01	79.8337839000000
2008-01-01	79.8106743000000
2008-04-01	79.7354523666666
2008-07-01	79.6425049333333
2008-10-01	79.5485707000000
2009-01-01	78.0669553333333
2009-04-01	77.5746846333333
2009-07-01	77.5131075666667
2009-10-01	78.0042708666667
2010-01-01	78.0714563000000
2010-04-01	78.2450360333333
2010-07-01	78.6269150333333
2010-10-01	79.4276012000000
2011-01-01	79.0319579333333
2011-04-01	78.7163927666667
2011-07-01	78.3760311333334
2011-10-01	78.5714768000000
2012-01-01	78.1051190000000
2012-04-01	78.2949962000000
2012-07-01	77.8591942000000
2012-10-01	78.2725308666667
2013-01-01	77.7124826666667
2013-04-01	77.7967257333333
2013-07-01	77.3289920000000
2013-10-01	77.3314361000000
2014-01-01	77.0047421000000
2014-04-01	77.1353464666666
2014-07-01	76.8336712333333
2014-10-01	77.3102521000000
2015-01-01	77.3948599000000
2015-04-01	77.6487818666667
2015-07-01	77.1692522000000
2015-10-01	77.9356600000000
2016-01-01	77.6704528333333
2016-04-01	77.7204665000000
2016-07-01	77.1527617000000
2016-10-01	77.6032094666667
2017-01-01	77.3572869333333
2017-04-01	78.0273191666667
2017-07-01	77.7548876000000
2017-10-01	78.4180262000000
2018-01-01	78.1779570333333
2018-04-01	78.3186579666666
2018-07-01	78.1907772666667