Quarter	US Dollars, monthly level
1988-01-01	1282642213.3005500
1988-04-01	1262072993.7981200
1988-07-01	1130180346.4624800
1988-10-01	1403046323.0280602
1989-01-01	1317153991.0176600
1989-04-01	1407813868.9883800
1989-07-01	1242597614.3387501
1989-10-01	1434074974.1125200
1990-01-01	1547147703.4277802
1990-04-01	1542631046.0320300
1990-07-01	1470223447.2451700
1990-10-01	1764319346.4865500
1991-01-01	1723064730.1986100
1991-04-01	1618885660.6978300
1991-07-01	1407516710.8193800
1991-10-01	1536361748.0995100
1992-01-01	1637803471.0124900
1992-04-01	1619699347.6986601
1992-07-01	1623070750.5569200
1992-10-01	1592829880.4255700
1993-01-01	1488627203.4061801
1993-04-01	1559993038.7215998
1993-07-01	1387957138.8106700
1993-10-01	1456800045.4652300
1994-01-01	1554398869.6270401
1994-04-01	1621014605.4624698
1994-07-01	1619641673.5884900
1994-10-01	1760474755.0509300
1995-01-01	1953692470.1608700
1995-04-01	2049840736.1883001
1995-07-01	1910584163.5256400
1995-10-01	1917980868.0832400
1996-01-01	1893260063.0886102
1996-04-01	1809670500.1764500
1996-07-01	1709984186.0755600
1996-10-01	1822503286.1058800
1997-01-01	1727062114.9111400
1997-04-01	1829271432.4861700
1997-07-01	1633930431.7585500
1997-10-01	1878354924.1455798
1998-01-01	1982742650.0573000
1998-04-01	2010149119.7814698
1998-07-01	1871644073.6926600
1998-10-01	2061080429.3593698
1999-01-01	1953745221.0509300
1999-04-01	2047890067.8876002
1999-07-01	2024914855.6810899
1999-10-01	2163334895.7870502
2000-01-01	2265881213.8830304
2000-04-01	2198513158.5374804
2000-07-01	1895742385.1176500
2000-10-01	2010924667.9970098
2001-01-01	2483487529.8600600
2001-04-01	2448713334.7669000
2001-07-01	2347738175.6654496
2001-10-01	2477416028.4560100
2002-01-01	2443110841.3501200
2002-04-01	2645270586.8836503
2002-07-01	2461075508.8468700
2002-10-01	2636144032.3517000
2003-01-01	2958390618.3998600
2003-04-01	3228117810.6312000
2003-07-01	3173724166.5128200
2003-10-01	3971913654.6779203
2004-01-01	3821884045.4554900
2004-04-01	3830707335.7973500
2004-07-01	3864733647.4831500
2004-10-01	4745679048.3594300
2005-01-01	4395526339.1527800
2005-04-01	4503152458.0327610
2005-07-01	4310341305.1920900
2005-10-01	5859636465.7091200
2006-01-01	5973893935.4115600
2006-04-01	5891155696.5917900
2006-07-01	5317848296.2170200
2006-10-01	5814292853.7297800
2007-01-01	5691202806.6541100
2007-04-01	5430954006.3123890
2007-07-01	5426934208.9188600
2007-10-01	6404191371.1763300
2008-01-01	6514574485.3987410
2008-04-01	6677775317.3015590
2008-07-01	6827316228.7238500
2008-10-01	5647378942.4449100
2009-01-01	5013120546.7582290
2009-04-01	4972085195.1539100
2009-07-01	5585862840.1209300
2009-10-01	5744100318.6984900
2010-01-01	4610350112.4553200
2010-04-01	4613168765.7080400
2010-07-01	4468700352.2709800
2010-10-01	5138205985.0799410
2011-01-01	5293269271.1893400
2011-04-01	5193229143.4463490
2011-07-01	5211030313.1681500
2011-10-01	5152785960.2312800
2012-01-01	5332135515.1348700
2012-04-01	4473695571.2185400
2012-07-01	3941212000.8423900
2012-10-01	5137356551.4293300
2013-01-01	4334181823.1885700
2013-04-01	4405639863.2597800
2013-07-01	4183027158.7230800
2013-10-01	5516057470.6592200
2014-01-01	4947240988.3294510
2014-04-01	4713359239.1429205
2014-07-01	4408132494.0674600
2014-10-01	5039271226.8325610
2015-01-01	4236515387.2627300
2015-04-01	4258824669.2360500
2015-07-01	3904722896.5543700
2015-10-01	4748491690.3910000
2016-01-01	4027498306.1181400
2016-04-01	4340339233.5913500
2016-07-01	3862769797.2522397
2016-10-01	3580332273.5116400
2017-01-01	3915649425.9441900
2017-04-01	3859421465.6819200
2017-07-01	3952096527.5242100
2017-10-01	4025651050.2335700
2018-01-01	4321540457.4201110
2018-04-01	4294330343.2846300