Quarter	Millions of US Dollars
1972-04-01	37
1972-07-01	36
1972-10-01	86
1973-01-01	91
1973-04-01	136
1973-07-01	137
1973-10-01	148
1974-01-01	170
1974-04-01	187
1974-07-01	184
1974-10-01	213
1975-01-01	242
1975-04-01	242
1975-07-01	228
1975-10-01	248
1976-01-01	251
1976-04-01	263
1976-07-01	668
1976-10-01	722
1977-01-01	809
1977-04-01	850
1977-07-01	940
1977-10-01	1015
1978-01-01	1221
1978-04-01	1386
1978-07-01	1572
1978-10-01	1715
1979-01-01	1933
1979-04-01	2029
1979-07-01	2265
1979-10-01	2229
1980-01-01	2132
1980-04-01	2325
1980-07-01	2472
1980-10-01	2502
1981-01-01	2431
1981-04-01	2376
1981-07-01	2516
1981-10-01	2769
1982-01-01	3060
1982-04-01	3295
1982-07-01	3269
1982-10-01	3932
1983-01-01	3948
1983-04-01	4164
1983-07-01	5509
1983-10-01	5687
1984-01-01	6181
1984-04-01	6085
1984-07-01	6354
1984-10-01	7352
1985-01-01	8110
1985-04-01	9654
1985-07-01	10872
1985-10-01	13244
1986-01-01	15162
1986-04-01	16316
1986-07-01	16978
1986-10-01	17114
1987-01-01	19015
1987-04-01	19244
1987-07-01	19491
1987-10-01	21895
1988-01-01	21572
1988-04-01	20543
1988-07-01	21156
1988-10-01	22367
1989-01-01	21569
1989-04-01	20901
1989-07-01	21052
1989-10-01	21630
1990-01-01	21412
1990-04-01	22040
1990-07-01	23632
1990-10-01	23903
1991-01-01	24013
1991-04-01	25765
1991-07-01	26762
1991-10-01	28267
1992-01-01	27795
1992-04-01	29170
1992-07-01	31437
1992-10-01	33105
1993-01-01	34452
1993-04-01	36306
1993-07-01	38079
1993-10-01	42088
1994-01-01	46756
1994-04-01	51411
1994-07-01	55998
1994-10-01	57318
1995-01-01	61121
1995-04-01	63618
1995-07-01	66669
1995-10-01	69045
1996-01-01	72678
1996-04-01	77753
1996-07-01	87840
1996-10-01	98808
1997-01-01	103737
1997-04-01	114632
1997-07-01	120573
1997-10-01	120383
1998-01-01	119225
1998-04-01	122981
1998-07-01	120545
1998-10-01	122292
1999-01-01	121227
1999-04-01	121020
1999-07-01	120017
1999-10-01	120266
2000-01-01	123336
2000-04-01	121275
2000-07-01	119351
2000-10-01	118667
2001-01-01	114420
2001-04-01	116372
2001-07-01	113646
2001-10-01	114835
2002-01-01	117055
2002-04-01	124796
2002-07-01	127786
2002-10-01	130665
2003-01-01	133158
2003-04-01	137640
2003-07-01	144151
2003-10-01	148311
2004-01-01	156465
2004-04-01	162078
2004-07-01	166945
2004-10-01	175531
2005-01-01	180428
2005-04-01	185007
2005-07-01	189798
2005-10-01	195261
2006-01-01	205524
2006-04-01	210902
2006-07-01	217847
2006-10-01	223147
2007-01-01	231325
2007-04-01	243493
2007-07-01	246911
2007-10-01	253813
2008-01-01	261105
2008-04-01	263129
2008-07-01	259938
2008-10-01	249957
2009-01-01	252951
2009-04-01	262045
2009-07-01	276619
2009-10-01	280691
2010-01-01	284316
2010-04-01	286073
2010-07-01	293955
2010-10-01	305012
2011-01-01	315323
2011-04-01	327549
2011-07-01	332276
2011-10-01	336554
2012-01-01	350083
2012-04-01	365323
2012-07-01	381908
2012-10-01	387432
2013-01-01	395737
2013-04-01	407526
2013-07-01	428158
2013-10-01	442886
2014-01-01	456434
2014-04-01	470074
2014-07-01	472067
2014-10-01	515573
2015-01-01	525729
2015-04-01	546633
2015-07-01	557674
2015-10-01	564335
2016-01-01	576248
2016-04-01	595541
2016-07-01	611626
2016-10-01	620800
2017-01-01	647268
2017-04-01	662982
2017-07-01	693517
2017-10-01	731655
2018-01-01	757488
2018-04-01	767636