Quarter	Millions of US Dollars
1970-10-01	15
1971-01-01	15
1971-04-01	15
1971-07-01	15
1971-10-01	40
1972-01-01	80
1972-04-01	119
1972-07-01	239
1972-10-01	298
1973-01-01	591
1973-04-01	761
1973-07-01	785
1973-10-01	786
1974-01-01	870
1974-04-01	939
1974-07-01	935
1974-10-01	1013
1975-01-01	1028
1975-04-01	1194
1975-07-01	1164
1975-10-01	1244
1976-01-01	1337
1976-04-01	1509
1976-07-01	1638
1976-10-01	1862
1977-01-01	1855
1977-04-01	2024
1977-07-01	2164
1977-10-01	2478
1978-01-01	2672
1978-04-01	2688
1978-07-01	2853
1978-10-01	2912
1979-01-01	3004
1979-04-01	3019
1979-07-01	3066
1979-10-01	3160
1980-01-01	3005
1980-04-01	3286
1980-07-01	3212
1980-10-01	3064
1981-01-01	2985
1981-04-01	2765
1981-07-01	2728
1981-10-01	2658
1982-01-01	2557
1982-04-01	2462
1982-07-01	2434
1982-10-01	2479
1983-01-01	2428
1983-04-01	2407
1983-07-01	2385
1983-10-01	2324
1984-01-01	2237
1984-04-01	2179
1984-07-01	2221
1984-10-01	2342
1985-01-01	2335
1985-04-01	2394
1985-07-01	2425
1985-10-01	2721
1986-01-01	2934
1986-04-01	3498
1986-07-01	3571
1986-10-01	4198
1987-01-01	4854
1987-04-01	5418
1987-07-01	5239
1987-10-01	5356
1988-01-01	5084
1988-04-01	4598
1988-07-01	4286
1988-10-01	4956
1989-01-01	4708
1989-04-01	4351
1989-07-01	4484
1989-10-01	4614
1990-01-01	5494
1990-04-01	5986
1990-07-01	7683
1990-10-01	9580
1991-01-01	10673
1991-04-01	12452
1991-07-01	15292
1991-10-01	18219
1992-01-01	18594
1992-04-01	21447
1992-07-01	21517
1992-10-01	21249
1993-01-01	21837
1993-04-01	23204
1993-07-01	28490
1993-10-01	28700
1994-01-01	29393
1994-04-01	31107
1994-07-01	33345
1994-10-01	34033
1995-01-01	34444
1995-04-01	37035
1995-07-01	36625
1995-10-01	40560
1996-01-01	43609
1996-04-01	44917
1996-07-01	46157
1996-10-01	49022
1997-01-01	50909
1997-04-01	57472
1997-07-01	59808
1997-10-01	64058
1998-01-01	72477
1998-04-01	78781
1998-07-01	84021
1998-10-01	88019
1999-01-01	90796
1999-04-01	101497
1999-07-01	112402
1999-10-01	121352
2000-01-01	127649
2000-04-01	139134
2000-07-01	142355
2000-10-01	153971
2001-01-01	154755
2001-04-01	154354
2001-07-01	155609
2001-10-01	153514
2002-01-01	154763
2002-04-01	170004
2002-07-01	173475
2002-10-01	180267
2003-01-01	181122
2003-04-01	189393
2003-07-01	198283
2003-10-01	213622
2004-01-01	210775
2004-04-01	210690
2004-07-01	211166
2004-10-01	228913
2005-01-01	222026
2005-04-01	213881
2005-07-01	212645
2005-10-01	216491
2006-01-01	233733
2006-04-01	244183
2006-07-01	259450
2006-10-01	271463
2007-01-01	278961
2007-04-01	285128
2007-07-01	301490
2007-10-01	306491
2008-01-01	313407
2008-04-01	321772
2008-07-01	298720
2008-10-01	282029
2009-01-01	280769
2009-04-01	313005
2009-07-01	309394
2009-10-01	307677
2010-01-01	297870
2010-04-01	288474
2010-07-01	307955
2010-10-01	298993
2011-01-01	312231
2011-04-01	327722
2011-07-01	320777
2011-10-01	325090
2012-01-01	347900
2012-04-01	341938
2012-07-01	359067
2012-10-01	364186
2013-01-01	358221
2013-04-01	356238
2013-07-01	384217
2013-10-01	395353
2014-01-01	381005
2014-04-01	376405
2014-07-01	381486
2014-10-01	374159
2015-01-01	355032
2015-04-01	375431
2015-07-01	372240
2015-10-01	379561
2016-01-01	386440
2016-04-01	374117
2016-07-01	370674
2016-10-01	357059
2017-01-01	359167
2017-04-01	371716
2017-07-01	383790
2017-10-01	388524
2018-01-01	394184
2018-04-01	391504