Quarter	Percent
1978-04-01	69.6693929333333
1978-07-01	68.5971144333333
1978-10-01	69.8204668333333
1979-01-01	71.9206684333333
1979-04-01	69.8444618333334
1979-07-01	69.2602638333334
1979-10-01	70.8761266333333
1980-01-01	72.9272422000000
1980-04-01	71.7922409333334
1980-07-01	71.4482618333333
1980-10-01	72.5332425666666
1981-01-01	73.8547508333334
1981-04-01	71.9147101000000
1981-07-01	71.1688952333333
1981-10-01	71.7014441333333
1982-01-01	73.7152705666666
1982-04-01	71.3059288666666
1982-07-01	70.2807681333333
1982-10-01	71.7164928333333
1983-01-01	72.8201892666666
1983-04-01	70.8212340000000
1983-07-01	70.0761386666667
1983-10-01	71.4474375333334
1984-01-01	72.8100681000000
1984-04-01	71.0043623000000
1984-07-01	69.9272171666667
1984-10-01	70.3430916000000
1985-01-01	72.5564967333334
1985-04-01	70.8565737333333
1985-07-01	70.3380079000000
1985-10-01	71.1189996000000
1986-01-01	73.4758791000000
1986-04-01	72.0383295000000
1986-07-01	70.7006517666667
1986-10-01	71.8172208333334
1987-01-01	73.1647436333334
1987-04-01	70.8344153333333
1987-07-01	69.9837534666667
1987-10-01	71.2032547666666
1988-01-01	72.8932931333333
1988-04-01	70.7043879333334
1988-07-01	69.6589104666667
1988-10-01	70.9012707666667
1989-01-01	73.4507255333334
1989-04-01	71.5267926000000
1989-07-01	71.3983404666666
1989-10-01	72.0020372666667
1990-01-01	73.3394608666667
1990-04-01	71.5877470000000
1990-07-01	71.3901318666666
1990-10-01	72.0978150000000
1991-01-01	71.9580525666667
1991-04-01	69.3859606000000
1991-07-01	68.0303909333333
1991-10-01	69.2565261333333
1992-01-01	70.7577055666667
1992-04-01	68.6570150333333
1992-07-01	68.7586413333333
1992-10-01	69.3721110000000
1993-01-01	70.8405415333334
1993-04-01	67.4428400000000
1993-07-01	67.3367148333333
1993-10-01	69.2832638666667
1994-01-01	72.1455335666666
1994-04-01	69.3688735666667
1994-07-01	69.6178853333333
1994-10-01	71.1727458000000
1995-01-01	73.0295462333333
1995-04-01	71.1107163000000
1995-07-01	70.6065411333333
1995-10-01	71.8144863666666
1996-01-01	73.0627543666667
1996-04-01	71.1512822666667
1996-07-01	70.8059729000000
1996-10-01	71.6307461333333
1997-01-01	72.3921624000000
1997-04-01	69.5123815333333
1997-07-01	68.1989114666667
1997-10-01	70.1224723333333
1998-01-01	71.3274000000000
1998-04-01	69.0584145666667
1998-07-01	68.8396980333333
1998-10-01	70.2510287333334
1999-01-01	71.1833972000000
1999-04-01	69.1919317000000
1999-07-01	68.9397810000000
1999-10-01	70.3825824666667
2000-01-01	71.2770718000000
2000-04-01	69.6162363333333
2000-07-01	69.5360795333333
2000-10-01	70.2990870333333
2001-01-01	71.4504275666667
2001-04-01	70.3234062666667
2001-07-01	69.9124469000000
2001-10-01	71.0024534666667
2002-01-01	71.5284579333334
2002-04-01	68.7836190333333
2002-07-01	69.0387530000000
2002-10-01	70.5566610000000
2003-01-01	71.9767727000000
2003-04-01	69.2042192000000
2003-07-01	68.7708287666667
2003-10-01	70.9444058666667
2004-01-01	71.8292560666667
2004-04-01	69.6627535666667
2004-07-01	68.5222170333333
2004-10-01	70.5540548333333
2005-01-01	72.1060478333333
2005-04-01	70.5773243000000
2005-07-01	69.7864740000000
2005-10-01	70.7805722000000
2006-01-01	72.0087157666667
2006-04-01	70.1653701666667
2006-07-01	70.0239018333334
2006-10-01	71.0123361000000
2007-01-01	71.8769571666667
2007-04-01	70.2005582000000
2007-07-01	69.4710276000000
2007-10-01	71.4984874000000
2008-01-01	72.5353704000000
2008-04-01	70.8628326000000
2008-07-01	69.4847150666667
2008-10-01	70.1352028000000
2009-01-01	71.0822266000000
2009-04-01	68.7620412666666
2009-07-01	67.3592253000000
2009-10-01	69.2148564000000
2010-01-01	70.1220357333333
2010-04-01	67.9397743000000
2010-07-01	66.8828314000000
2010-10-01	68.7583327333333
2011-01-01	70.0387992666666
2011-04-01	67.4837589666666
2011-07-01	67.1477175000000
2011-10-01	67.9061153666667
2012-01-01	69.1237704666667
2012-04-01	67.4295693000000
2012-07-01	66.0188152000000
2012-10-01	67.5155214666667
2013-01-01	68.4391161666667
2013-04-01	66.5685143000000
2013-07-01	65.8992684666667
2013-10-01	66.4040984000000
2014-01-01	67.6194072666667
2014-04-01	65.9778177666667
2014-07-01	65.4221457666667
2014-10-01	67.2934547000000
2015-01-01	68.4843158666667
2015-04-01	66.8676695000000
2015-07-01	65.9979208000000
2015-10-01	67.7873945333333
2016-01-01	68.1456036666666
2016-04-01	66.9411742666667
2016-07-01	65.6331171666667
2016-10-01	66.4341794000000
2017-01-01	67.7925681000000
2017-04-01	66.1762408333333
2017-07-01	66.2185361000000
2017-10-01	67.3136080333333
2018-01-01	69.1543181000000
2018-04-01	67.7926576000000
2018-07-01	66.5156524000000