Quarter	US Dollars, monthly level
1988-01-01	1455578708.6467100
1988-04-01	1488695480.3336000
1988-07-01	1352315760.2340800
1988-10-01	1523082849.8004500
1989-01-01	1537438689.9457898
1989-04-01	1536474399.8943600
1989-07-01	1453198982.1624900
1989-10-01	1693971264.4915400
1990-01-01	1785213449.2813900
1990-04-01	1839579197.8617000
1990-07-01	1850812457.2664000
1990-10-01	2141282756.7537498
1991-01-01	2162261245.7163500
1991-04-01	1987872105.0631100
1991-07-01	1855391938.1767201
1991-10-01	2050500767.4206598
1992-01-01	2056357351.6318598
1992-04-01	2010916560.4262903
1992-07-01	2039664412.8971500
1992-10-01	2116616720.5725500
1993-01-01	1953095828.9114700
1993-04-01	1944118787.4981400
1993-07-01	1717167057.2701900
1993-10-01	2082937586.6412199
1994-01-01	1974371417.2360800
1994-04-01	2073706550.7148902
1994-07-01	2096047187.9392300
1994-10-01	2278530422.0741000
1995-01-01	2481049221.7566200
1995-04-01	2609325082.5252600
1995-07-01	2461051951.6013400
1995-10-01	2458389955.7498500
1996-01-01	2553542395.9700003
1996-04-01	2427206971.4552603
1996-07-01	2242488519.3336997
1996-10-01	2435372328.6163900
1997-01-01	2284702783.7936200
1997-04-01	2314225481.0267400
1997-07-01	2288194890.3570700
1997-10-01	2562616227.2448897
1998-01-01	2442232605.5725400
1998-04-01	2513788965.1623100
1998-07-01	2399171139.8200502
1998-10-01	2884272924.1705400
1999-01-01	2754345152.7801900
1999-04-01	2642040139.6122800
1999-07-01	2663166955.2948200
1999-10-01	3135172630.9958700
2000-01-01	2852646287.2291300
2000-04-01	2855962537.4484100
2000-07-01	2633939878.3563500
2000-10-01	2902684857.7631903
2001-01-01	3058086814.3320800
2001-04-01	3191023887.9276400
2001-07-01	3052329463.3448500
2001-10-01	3019760026.8377600
2002-01-01	2938120147.3591600
2002-04-01	3067776148.9434900
2002-07-01	3157180701.3995500
2002-10-01	3477424163.9315200
2003-01-01	3621659708.2048500
2003-04-01	4274126359.6264796
2003-07-01	3800506666.2912703
2003-10-01	4495209561.1343600
2004-01-01	4745082019.8603990
2004-04-01	4922696974.7045400
2004-07-01	4749415187.2029500
2004-10-01	5641399723.8839700
2005-01-01	5373402530.0012800
2005-04-01	5356464256.4958105
2005-07-01	5073492083.4605900
2005-10-01	6702368336.7114200
2006-01-01	6759901230.7105600
2006-04-01	6987787491.6385510
2006-07-01	6271651416.8793700
2006-10-01	7108428573.4986510
2007-01-01	6858545189.3927190
2007-04-01	6693383161.6531200
2007-07-01	6768987800.0920600
2007-10-01	7731963685.0791810
2008-01-01	7963324055.5279500
2008-04-01	8530757975.0185900
2008-07-01	8456905188.8872400
2008-10-01	7189191261.9378100
2009-01-01	6036082069.3368800
2009-04-01	6296265513.8023300
2009-07-01	5956808257.9584800
2009-10-01	6984876754.3492390
2010-01-01	5981892652.2088190
2010-04-01	6372624123.6693600
2010-07-01	5598749162.1026600
2010-10-01	6840412922.3529200
2011-01-01	6702557051.1098995
2011-04-01	7130874675.4025300
2011-07-01	7433601886.3782100
2011-10-01	7590398175.3056100
2012-01-01	7029581324.3610700
2012-04-01	6675096592.8820200
2012-07-01	6314553807.3785990
2012-10-01	7316081713.9865900
2013-01-01	6548330550.5295800
2013-04-01	6577752997.7221600
2013-07-01	6395492782.9467000
2013-10-01	7145590392.5537000
2014-01-01	6799140595.9445900
2014-04-01	6489338743.4020500
2014-07-01	6343256934.1842100
2014-10-01	7029639801.1713200
2015-01-01	6006434923.9606000
2015-04-01	5738965090.4533500
2015-07-01	5592953977.0523900
2015-10-01	5954694270.8303800
2016-01-01	5300337356.5307090
2016-04-01	5633483030.8030810
2016-07-01	5213158565.8830900
2016-10-01	5621481615.3002000
2017-01-01	5552656405.9569800
2017-04-01	5699868796.8610300
2017-07-01	5451041508.7336100
2017-10-01	5962010443.9085600
2018-01-01	6289596369.7633800
2018-04-01	6107036930.9591700