Quarter	Percent
1978-04-01	22.5549923446642
1978-07-01	22.3186047718291
1978-10-01	21.8751292390125
1979-01-01	21.4043550934481
1979-04-01	21.1313941142543
1979-07-01	20.6551061980633
1979-10-01	20.6612074791627
1980-01-01	20.8658722537269
1980-04-01	21.8524779951811
1980-07-01	22.6116798371546
1980-10-01	21.9698047423254
1981-01-01	20.8585025222826
1981-04-01	20.7372340329579
1981-07-01	21.6915392168087
1981-10-01	21.5373584204315
1982-01-01	20.3821943868327
1982-04-01	19.8293772513289
1982-07-01	18.8957727665062
1982-10-01	20.7796319266243
1983-01-01	21.0394871200732
1983-04-01	20.3138209475100
1983-07-01	20.7437132423668
1983-10-01	20.5192907688195
1984-01-01	20.7085375900892
1984-04-01	20.6858294469892
1984-07-01	20.4456042133826
1984-10-01	20.8174644347138
1985-01-01	20.2330595900059
1985-04-01	19.8438749469608
1985-07-01	20.1536955078837
1985-10-01	20.4637480497010
1986-01-01	20.9426340809273
1986-04-01	21.6812021605908
1986-07-01	21.1585656678673
1986-10-01	21.8012382162447
1987-01-01	22.2563055938305
1987-04-01	22.6000346191965
1987-07-01	22.2448117480430
1987-10-01	21.7971917559614
1988-01-01	21.8187033106466
1988-04-01	22.6872154107789
1988-07-01	22.9017104655405
1988-10-01	23.7008603965683
1989-01-01	23.5171458812336
1989-04-01	23.9760628343879
1989-07-01	23.3771271853457
1989-10-01	23.5962051977180
1990-01-01	23.0201628752672
1990-04-01	24.4185731577743
1990-07-01	25.7238108866903
1990-10-01	26.2147136643376
1991-01-01	25.0843977920445
1991-04-01	25.5904460375390
1991-07-01	25.0503875138604
1991-10-01	25.7592860475695
1992-01-01	24.9072378444140
1992-04-01	25.4074570644605
1992-07-01	25.5821160704803
1992-10-01	25.1510067424959
1993-01-01	25.3850455502963
1993-04-01	25.6332726574340
1993-07-01	26.6790042894949
1993-10-01	27.1399007498651
1994-01-01	26.8644087491053
1994-04-01	27.8912800837765
1994-07-01	27.9502137724485
1994-10-01	27.9830033008651
1995-01-01	27.0691633682871
1995-04-01	28.5711399524280
1995-07-01	28.5631707215883
1995-10-01	29.8214646786470
1996-01-01	30.6063242630784
1996-04-01	30.8117759024128
1996-07-01	31.1297015844618
1996-10-01	30.8095857422865
1997-01-01	30.8821903488466
1997-04-01	31.3854357877548
1997-07-01	31.3881788451347
1997-10-01	31.1075636458548
1998-01-01	31.0438366140526
1998-04-01	32.6613553595744
1998-07-01	33.0880167861847
1998-10-01	32.3314538891003
1999-01-01	31.1215099658074
1999-04-01	31.8382355113862
1999-07-01	32.8419963905479
1999-10-01	33.7360827182084
2000-01-01	34.1869567280672
2000-04-01	35.7505536629899
2000-07-01	35.9815609518764
2000-10-01	35.4143139120322
2001-01-01	35.2570588202366
2001-04-01	37.5296252952504
2001-07-01	37.4381432613384
2001-10-01	38.1665150098075
2002-01-01	38.7382022126266
2002-04-01	38.8644886080621
2002-07-01	38.8703047940900
2002-10-01	39.7480951243474
2003-01-01	39.9048072390433
2003-04-01	41.2737659615389
2003-07-01	41.0854080982579
2003-10-01	41.0035586297759
2004-01-01	40.5322172508209
2004-04-01	42.1969902789212
2004-07-01	43.4576499188941
2004-10-01	43.4564688943469
2005-01-01	43.3364774308251
2005-04-01	43.9790891819746
2005-07-01	44.9704886171944
2005-10-01	45.2855971459575
2006-01-01	45.7521653497903
2006-04-01	47.0607372127051
2006-07-01	47.9412032296320
2006-10-01	48.1137390991943
2007-01-01	47.7060383417018
2007-04-01	48.7150858300099
2007-07-01	48.8060328614849
2007-10-01	48.9850406194194
2008-01-01	48.7632672678552
2008-04-01	49.9053344221817
2008-07-01	50.8857452997586
2008-10-01	50.7972107264964
2009-01-01	52.0236456289487
2009-04-01	52.9998992262822
2009-07-01	52.5295982428887
2009-10-01	53.9369516403964
2010-01-01	53.4760021267533
2010-04-01	53.6769453273251
2010-07-01	54.4092209583918
2010-10-01	55.0108506287451
2011-01-01	53.7942346168323
2011-04-01	54.8188743739005
2011-07-01	55.8395202340700
2011-10-01	55.4403430730731
2012-01-01	55.0679864294730
2012-04-01	55.8106830484038
2012-07-01	56.1275151897142
2012-10-01	55.6343614767320
2013-01-01	55.4214764728614
2013-04-01	56.5130467178015
2013-07-01	55.7108082283930
2013-10-01	55.5082364149887
2014-01-01	55.1751315258744
2014-04-01	56.4169052114826
2014-07-01	56.7983464631975
2014-10-01	56.2869959113936
2015-01-01	56.0182018871971
2015-04-01	56.8209650214687
2015-07-01	57.2625486763585
2015-10-01	58.9582148148917
2016-01-01	58.7171996865022
2016-04-01	58.9899474898032
2016-07-01	58.5592285851478
2016-10-01	59.0306606307038
2017-01-01	59.3353979367516
2017-04-01	60.6202966361092
2017-07-01	60.2708323773271
2017-10-01	60.1452211540902
2018-01-01	59.4313577595380
2018-04-01	60.4355259503476
2018-07-01	60.9586254288245