Quarter	Percent
1960-01-01	64.4258005606796
1960-04-01	69.6869566370104
1960-07-01	69.7937124126432
1960-10-01	68.8436217593810
1961-01-01	65.3538815611449
1961-04-01	69.6378999979659
1961-07-01	69.2600153582807
1961-10-01	68.5241946401682
1962-01-01	64.7068741997604
1962-04-01	69.2286837737885
1962-07-01	68.6504405389576
1962-10-01	67.2750615159924
1963-01-01	63.0778272592053
1963-04-01	67.9497801145591
1963-07-01	67.5566203916417
1963-10-01	66.3515544722594
1964-01-01	62.8670097057008
1964-04-01	67.1624875558264
1964-07-01	66.3650978585542
1964-10-01	65.1984185387836
1965-01-01	62.2808573207346
1965-04-01	66.3891210874968
1965-07-01	66.1204288352190
1965-10-01	64.8894182432976
1966-01-01	62.3916774850690
1966-04-01	66.6345961175881
1966-07-01	66.0925614683634
1966-10-01	64.8144270766866
1967-01-01	62.2451448239222
1967-04-01	67.0387443825663
1967-07-01	66.3633886312014
1967-10-01	64.8829594415607
1968-01-01	62.5395483156343
1968-04-01	66.8346098093904
1968-07-01	66.3458359390151
1968-10-01	65.1254410712636
1969-01-01	62.5308536963970
1969-04-01	66.3470280460441
1969-07-01	65.9488419050834
1969-10-01	64.5595173605762
1970-01-01	62.6371391877240
1970-04-01	66.0913864318212
1970-07-01	65.7220265266095
1970-10-01	64.2276137145900
1971-01-01	62.7443286925658
1971-04-01	65.5939519070719
1971-07-01	64.9842731755317
1971-10-01	63.8204644162041
1972-01-01	61.9786186967461
1972-04-01	64.5201654175034
1972-07-01	64.3375537814441
1972-10-01	63.6347893653840
1973-01-01	62.6024398425692
1973-04-01	64.5950590658812
1973-07-01	64.6218507803928
1973-10-01	64.1306609158587
1974-01-01	61.6908885585610
1974-04-01	64.1075846300718
1974-07-01	63.4731749255614
1974-10-01	62.5663459365828
1975-01-01	60.3492166622769
1975-04-01	62.9255017311516
1975-07-01	62.9179173721430
1975-10-01	61.9603637167915
1976-01-01	60.3904794087495
1976-04-01	62.4937980445838
1976-07-01	62.7245148866148
1976-10-01	61.9154303631369
1977-01-01	60.2578779168770
1977-04-01	62.9430799992760
1977-07-01	62.9146006301084
1977-10-01	62.0647932741980
1978-01-01	60.4129875610571
1978-04-01	63.2518396630468
1978-07-01	62.7747480626792
1978-10-01	62.1534050046670
1979-01-01	60.6107619419480
1979-04-01	63.2147887490513
1979-07-01	63.1113170951658
1979-10-01	62.2405665473159
1980-01-01	60.5899473221939
1980-04-01	63.0973201441008
1980-07-01	63.1095110080772
1980-10-01	62.0280244578635
1981-01-01	60.5993179700599
1981-04-01	62.9500582896246
1981-07-01	62.7804293934931
1981-10-01	62.1041118931823
1982-01-01	60.6679595122367
1982-04-01	62.9288295278041
1982-07-01	62.4777057261777
1982-10-01	62.2055282847300
1983-01-01	61.0151836667520
1983-04-01	63.2741769265927
1983-07-01	62.9350158934918
1983-10-01	62.1762330357368
1984-01-01	60.4434909992246
1984-04-01	62.8345667719504
1984-07-01	62.6976364244050
1984-10-01	62.0301296216872
1985-01-01	60.5370703896368
1985-04-01	62.5552834902984
1985-07-01	62.3272686624669
1985-10-01	61.3254670335854
1986-01-01	60.1585154782621
1986-04-01	62.2045611636265
1986-07-01	62.0528403251541
1986-10-01	61.1854557353639
1987-01-01	59.6606833823152
1987-04-01	61.8525145420886
1987-07-01	61.7906504564154
1987-10-01	61.2359978182575
1988-01-01	59.8816117796944
1988-04-01	62.1718907386460
1988-07-01	61.9679411610504
1988-10-01	61.2875829136967
1989-01-01	60.1671337258187
1989-04-01	62.5407694225536
1989-07-01	62.3999052910867
1989-10-01	61.8659517150365
1990-01-01	60.8288552127114
1990-04-01	62.9429705738480
1990-07-01	62.8030941652797
1990-10-01	62.3767644716466
1991-01-01	61.3668429737870
1991-04-01	63.4177032967802
1991-07-01	63.2454428550599
1991-10-01	62.8384660982707
1992-01-01	61.7331375138205
1992-04-01	63.3830218015459
1992-07-01	63.0439189976394
1992-10-01	62.8175620372962
1993-01-01	61.1678596699294
1993-04-01	62.9643359230376
1993-07-01	62.7115543137636
1993-10-01	62.2887644431789
1994-01-01	60.8242303751882
1994-04-01	62.6936966311838
1994-07-01	62.1950389555005
1994-10-01	61.6276491275539
1995-01-01	60.4903531797777
1995-04-01	62.1304839349460
1995-07-01	62.0757040017892
1995-10-01	61.2029375740539
1996-01-01	60.1530252798416
1996-04-01	61.9541137249564
1996-07-01	62.1295274084433
1996-10-01	61.3845981064602
1997-01-01	60.6317341744183
1997-04-01	62.2765467877637
1997-07-01	62.0524308602539
1997-10-01	61.3025645510830
1998-01-01	60.2680550674706
1998-04-01	61.4379900041040
1998-07-01	61.0579286312833
1998-10-01	60.3587105970199
1999-01-01	59.2094157815515
1999-04-01	60.4914027076809
1999-07-01	60.3984739361554
1999-10-01	59.9437969719896
2000-01-01	58.6506099629090
2000-04-01	59.9407064178982
2000-07-01	59.8928834403829
2000-10-01	59.7580229912465
2001-01-01	58.6386616234391
2001-04-01	59.3938914811821
2001-07-01	59.0952205910812
2001-10-01	58.6740804718980
2002-01-01	57.4991383446570
2002-04-01	58.2365017259527
2002-07-01	58.2790006575799
2002-10-01	57.9093545104171
2003-01-01	56.9031245354109
2003-04-01	58.0798168989563
2003-07-01	58.0571222882600
2003-10-01	57.6609363610621
2004-01-01	56.8557394107951
2004-04-01	58.0323671953545
2004-07-01	58.1212645799991
2004-10-01	57.5901763525842
2005-01-01	56.8650649193059
2005-04-01	58.2426888267747
2005-07-01	58.3464184313670
2005-10-01	57.7570986778375
2006-01-01	57.0960568291806
2006-04-01	58.3066720022900
2006-07-01	58.3630605514023
2006-10-01	58.0890686215581
2007-01-01	57.2462549368849
2007-04-01	58.7186700345261
2007-07-01	58.3755436238577
2007-10-01	58.1298791632757
2008-01-01	57.2288413923925
2008-04-01	58.4569174228254
2008-07-01	57.9802285619025
2008-10-01	57.6925132703876
2009-01-01	56.7966682905159
2009-04-01	57.2669107018810
2009-07-01	56.9476525525664
2009-10-01	56.6204962304141
2010-01-01	56.2441619326647
2010-04-01	56.9433915714990
2010-07-01	56.9726475642694
2010-10-01	56.7032628556919
2011-01-01	56.2936718774306
2011-04-01	56.8198726618444
2011-07-01	56.7343377919251
2011-10-01	56.6715612105495
2012-01-01	56.0322994443394
2012-04-01	56.7487425411499
2012-07-01	56.7034657552705
2012-10-01	56.6536980141635
2013-01-01	56.3277198510974
2013-04-01	57.1428546693411
2013-07-01	57.1175062705804
2013-10-01	57.3400430978579
2014-01-01	56.7490806735132
2014-04-01	57.6112880593637
2014-07-01	57.5896446909414
2014-10-01	57.5775736788728
2015-01-01	57.1166946084979
2015-04-01	57.7693541150620
2015-07-01	57.8704999472855
2015-10-01	57.8394171595568
2016-01-01	57.5305119285967
2016-04-01	58.2796906840094
2016-07-01	58.5789736630903
2016-10-01	58.4808722703547
2017-01-01	58.0392999933747
2017-04-01	58.9612972580496
2017-07-01	59.2338979179187
2017-10-01	59.0680812446260
2018-01-01	59.3857467115208
2018-04-01	60.2626135084771
2018-07-01	60.2728519118016