Quarter	Millions of US Dollars
1966-04-01	10
1966-07-01	10
1966-10-01	10
1967-01-01	10
1967-04-01	35
1967-07-01	35
1967-10-01	35
1968-01-01	35
1968-04-01	35
1968-07-01	35
1968-10-01	35
1969-01-01	35
1969-04-01	35
1969-07-01	35
1969-10-01	35
1970-01-01	35
1970-04-01	35
1970-07-01	35
1970-10-01	35
1971-01-01	64
1971-04-01	64
1971-07-01	64
1971-10-01	77
1972-01-01	135
1972-04-01	180
1972-07-01	278
1972-10-01	408
1973-01-01	473
1973-04-01	553
1973-07-01	592
1973-10-01	596
1974-01-01	633
1974-04-01	635
1974-07-01	628
1974-10-01	725
1975-01-01	760
1975-04-01	837
1975-07-01	850
1975-10-01	988
1976-01-01	1127
1976-04-01	1240
1976-07-01	1568
1976-10-01	1833
1977-01-01	2090
1977-04-01	2303
1977-07-01	2483
1977-10-01	2963
1978-01-01	3344
1978-04-01	3551
1978-07-01	4242
1978-10-01	4385
1979-01-01	4427
1979-04-01	4602
1979-07-01	5023
1979-10-01	4997
1980-01-01	4706
1980-04-01	5565
1980-07-01	5844
1980-10-01	5679
1981-01-01	5558
1981-04-01	5346
1981-07-01	5753
1981-10-01	6215
1982-01-01	6088
1982-04-01	6102
1982-07-01	5875
1982-10-01	6449
1983-01-01	6422
1983-04-01	6604
1983-07-01	6775
1983-10-01	7502
1984-01-01	8754
1984-04-01	8844
1984-07-01	9651
1984-10-01	10284
1985-01-01	10636
1985-04-01	11688
1985-07-01	11893
1985-10-01	12405
1986-01-01	12917
1986-04-01	14389
1986-07-01	18106
1986-10-01	20066
1987-01-01	24483
1987-04-01	25116
1987-07-01	25713
1987-10-01	28115
1988-01-01	28240
1988-04-01	27918
1988-07-01	27646
1988-10-01	28392
1989-01-01	27855
1989-04-01	27640
1989-07-01	28903
1989-10-01	30654
1990-01-01	31958
1990-04-01	31646
1990-07-01	34440
1990-10-01	34519
1991-01-01	31432
1991-04-01	30260
1991-07-01	30459
1991-10-01	29507
1992-01-01	26587
1992-04-01	26652
1992-07-01	27584
1992-10-01	25947
1993-01-01	27547
1993-04-01	27393
1993-07-01	33672
1993-10-01	32562
1994-01-01	32780
1994-04-01	31883
1994-07-01	32585
1994-10-01	31776
1995-01-01	33497
1995-04-01	33818
1995-07-01	32637
1995-10-01	32002
1996-01-01	30833
1996-04-01	30917
1996-07-01	31297
1996-10-01	31076
1997-01-01	30260
1997-04-01	31293
1997-07-01	30334
1997-10-01	29546
1998-01-01	28227
1998-04-01	28329
1998-07-01	29788
1998-10-01	29727
1999-01-01	29001
1999-04-01	28668
1999-07-01	32226
1999-10-01	30546
2000-01-01	29744
2000-04-01	29957
2000-07-01	29088
2000-10-01	30622
2001-01-01	31583
2001-04-01	32792
2001-07-01	34092
2001-10-01	33358
2002-01-01	32802
2002-04-01	34763
2002-07-01	34530
2002-10-01	36062
2003-01-01	40137
2003-04-01	44716
2003-07-01	46337
2003-10-01	50342
2004-01-01	51987
2004-04-01	52918
2004-07-01	52789
2004-10-01	58787
2005-01-01	65080
2005-04-01	66128
2005-07-01	67200
2005-10-01	71444
2006-01-01	75086
2006-04-01	82422
2006-07-01	82558
2006-10-01	90702
2007-01-01	97777
2007-04-01	104474
2007-07-01	105349
2007-10-01	107131
2008-01-01	113589
2008-04-01	119432
2008-07-01	117189
2008-10-01	119440
2009-01-01	129054
2009-04-01	146819
2009-07-01	157732
2009-10-01	156023
2010-01-01	148252
2010-04-01	145733
2010-07-01	139725
2010-10-01	139038
2011-01-01	156665
2011-04-01	158638
2011-07-01	155118
2011-10-01	142200
2012-01-01	148738
2012-04-01	135566
2012-07-01	143373
2012-10-01	148087
2013-01-01	139654
2013-04-01	136985
2013-07-01	140034
2013-10-01	142247
2014-01-01	138611
2014-04-01	135523
2014-07-01	128669
2014-10-01	125745
2015-01-01	120705
2015-04-01	122958
2015-07-01	123915
2015-10-01	121025
2016-01-01	126358
2016-04-01	123867
2016-07-01	127422
2016-10-01	121151
2017-01-01	124195
2017-04-01	129476
2017-07-01	131783
2017-10-01	131697
2018-01-01	131785
2018-04-01	127688