Quarter	Millions of US Dollars
1968-04-01	30
1968-07-01	30
1968-10-01	30
1969-01-01	90
1969-04-01	90
1969-07-01	90
1969-10-01	90
1970-01-01	90
1970-04-01	90
1970-07-01	90
1970-10-01	105
1971-01-01	212
1971-04-01	232
1971-07-01	252
1971-10-01	372
1972-01-01	488
1972-04-01	750
1972-07-01	1020
1972-10-01	1202
1973-01-01	1716
1973-04-01	2269
1973-07-01	2527
1973-10-01	2654
1974-01-01	2817
1974-04-01	2860
1974-07-01	2935
1974-10-01	3183
1975-01-01	3237
1975-04-01	3334
1975-07-01	3333
1975-10-01	3478
1976-01-01	3844
1976-04-01	4205
1976-07-01	4377
1976-10-01	4692
1977-01-01	4926
1977-04-01	5273
1977-07-01	5717
1977-10-01	6186
1978-01-01	6561
1978-04-01	6983
1978-07-01	7512
1978-10-01	7532
1979-01-01	7622
1979-04-01	7877
1979-07-01	8028
1979-10-01	8400
1980-01-01	8216
1980-04-01	9001
1980-07-01	9341
1980-10-01	9361
1981-01-01	9198
1981-04-01	9013
1981-07-01	9323
1981-10-01	10049
1982-01-01	9872
1982-04-01	10057
1982-07-01	10381
1982-10-01	11435
1983-01-01	11944
1983-04-01	12145
1983-07-01	12120
1983-10-01	12915
1984-01-01	14346
1984-04-01	14414
1984-07-01	14748
1984-10-01	16087
1985-01-01	16683
1985-04-01	17178
1985-07-01	18829
1985-10-01	22424
1986-01-01	23404
1986-04-01	24773
1986-07-01	26617
1986-10-01	27120
1987-01-01	29742
1987-04-01	31838
1987-07-01	32574
1987-10-01	36103
1988-01-01	41079
1988-04-01	43141
1988-07-01	46462
1988-10-01	47900
1989-01-01	49169
1989-04-01	48982
1989-07-01	54980
1989-10-01	58165
1990-01-01	62974
1990-04-01	67057
1990-07-01	77954
1990-10-01	86139
1991-01-01	91556
1991-04-01	95602
1991-07-01	107115
1991-10-01	117405
1992-01-01	121119
1992-04-01	131601
1992-07-01	130318
1992-10-01	127657
1993-01-01	124133
1993-04-01	131174
1993-07-01	124460
1993-10-01	126489
1994-01-01	134771
1994-04-01	141279
1994-07-01	149291
1994-10-01	151085
1995-01-01	158501
1995-04-01	160786
1995-07-01	162618
1995-10-01	165029
1996-01-01	167260
1996-04-01	171875
1996-07-01	178688
1996-10-01	205471
1997-01-01	210676
1997-04-01	222695
1997-07-01	226541
1997-10-01	242098
1998-01-01	265527
1998-04-01	279265
1998-07-01	290804
1998-10-01	295885
1999-01-01	315558
1999-04-01	343576
1999-07-01	390708
1999-10-01	412958
2000-01-01	441175
2000-04-01	462278
2000-07-01	469438
2000-10-01	504237
2001-01-01	504252
2001-04-01	517669
2001-07-01	554233
2001-10-01	562032
2002-01-01	573382
2002-04-01	648721
2002-07-01	681988
2002-10-01	720225
2003-01-01	769207
2003-04-01	847629
2003-07-01	902084
2003-10-01	1012757
2004-01-01	1068557
2004-04-01	1105930
2004-07-01	1158251
2004-10-01	1288207
2005-01-01	1320902
2005-04-01	1328671
2005-07-01	1371817
2005-10-01	1427924
2006-01-01	1519077
2006-04-01	1638572
2006-07-01	1733752
2006-10-01	1929953
2007-01-01	2043481
2007-04-01	2182080
2007-07-01	2291411
2007-10-01	2356318
2008-01-01	2443648
2008-04-01	2609027
2008-07-01	2543711
2008-10-01	2615150
2009-01-01	2620604
2009-04-01	2890333
2009-07-01	2991744
2009-10-01	2987469
2010-01-01	2874244
2010-04-01	2767088
2010-07-01	2979338
2010-10-01	2899512
2011-01-01	2994435
2011-04-01	3035546
2011-07-01	2914515
2011-10-01	2843611
2012-01-01	2931272
2012-04-01	2787460
2012-07-01	2833264
2012-10-01	2834826
2013-01-01	2725536
2013-04-01	2697277
2013-07-01	2787128
2013-10-01	2828381
2014-01-01	2807378
2014-04-01	2828756
2014-07-01	2721805
2014-10-01	2624148
2015-01-01	2478728
2015-04-01	2598078
2015-07-01	2559777
2015-10-01	2494352
2016-01-01	2524130
2016-04-01	2408621
2016-07-01	2412041
2016-10-01	2337658
2017-01-01	2374430
2017-04-01	2491682
2017-07-01	2585074
2017-10-01	2625772
2018-01-01	2685130
2018-04-01	2622222