Quarter	Millions of US Dollars
1977-04-01	50
1977-07-01	50
1977-10-01	50
1978-01-01	50
1978-04-01	50
1978-07-01	50
1978-10-01	50
1979-01-01	50
1979-04-01	50
1979-07-01	50
1979-10-01	50
1980-01-01	50
1980-04-01	80
1980-07-01	80
1980-10-01	80
1981-01-01	80
1981-04-01	80
1981-07-01	80
1981-10-01	80
1982-01-01	80
1982-04-01	30
1982-07-01	49
1982-10-01	76
1983-01-01	96
1983-04-01	95
1983-07-01	96
1983-10-01	126
1984-01-01	250
1984-04-01	368
1984-07-01	403
1984-10-01	438
1985-01-01	479
1985-04-01	539
1985-07-01	731
1985-10-01	824
1986-01-01	965
1986-04-01	1198
1986-07-01	1429
1986-10-01	1456
1987-01-01	1980
1987-04-01	2209
1987-07-01	2614
1987-10-01	3021
1988-01-01	3477
1988-04-01	3888
1988-07-01	3927
1988-10-01	4760
1989-01-01	4532
1989-04-01	4364
1989-07-01	4416
1989-10-01	4390
1990-01-01	4200
1990-04-01	4290
1990-07-01	4417
1990-10-01	3682
1991-01-01	2683
1991-04-01	2648
1991-07-01	2736
1991-10-01	3086
1992-01-01	2869
1992-04-01	3162
1992-07-01	3056
1992-10-01	2697
1993-01-01	3324
1993-04-01	3085
1993-07-01	4335
1993-10-01	5070
1994-01-01	6017
1994-04-01	6108
1994-07-01	7759
1994-10-01	8146
1995-01-01	9797
1995-04-01	11119
1995-07-01	10608
1995-10-01	11498
1996-01-01	11569
1996-04-01	12883
1996-07-01	12538
1996-10-01	12776
1997-01-01	12724
1997-04-01	13621
1997-07-01	14458
1997-10-01	14923
1998-01-01	15646
1998-04-01	16151
1998-07-01	16971
1998-10-01	17102
1999-01-01	15734
1999-04-01	18262
1999-07-01	20007
1999-10-01	22737
2000-01-01	23722
2000-04-01	25242
2000-07-01	26840
2000-10-01	29493
2001-01-01	32307
2001-04-01	35786
2001-07-01	40707
2001-10-01	43432
2002-01-01	45386
2002-04-01	55178
2002-07-01	54538
2002-10-01	59579
2003-01-01	64778
2003-04-01	73079
2003-07-01	77026
2003-10-01	89625
2004-01-01	89441
2004-04-01	92895
2004-07-01	94855
2004-10-01	107176
2005-01-01	105599
2005-04-01	100567
2005-07-01	98374
2005-10-01	111362
2006-01-01	119121
2006-04-01	127593
2006-07-01	135632
2006-10-01	152587
2007-01-01	155274
2007-04-01	173395
2007-07-01	182777
2007-10-01	194021
2008-01-01	214523
2008-04-01	224577
2008-07-01	204961
2008-10-01	201631
2009-01-01	210652
2009-04-01	238549
2009-07-01	258189
2009-10-01	255717
2010-01-01	250448
2010-04-01	217916
2010-07-01	238473
2010-10-01	230330
2011-01-01	241411
2011-04-01	233071
2011-07-01	214947
2011-10-01	207952
2012-01-01	202259
2012-04-01	184439
2012-07-01	177629
2012-10-01	185190
2013-01-01	177109
2013-04-01	174419
2013-07-01	177900
2013-10-01	179761
2014-01-01	175480
2014-04-01	161072
2014-07-01	150571
2014-10-01	137281
2015-01-01	119056
2015-04-01	122490
2015-07-01	120304
2015-10-01	114522
2016-01-01	118442
2016-04-01	113611
2016-07-01	114815
2016-10-01	101349
2017-01-01	98894
2017-04-01	106400
2017-07-01	107186
2017-10-01	103977
2018-01-01	107737
2018-04-01	102921