Quarter	Millions of US Dollars
1966-07-01	0
1966-10-01	0
1967-01-01	0
1967-04-01	0
1967-07-01	0
1967-10-01	0
1968-01-01	0
1968-04-01	0
1968-07-01	0
1968-10-01	0
1969-01-01	0
1969-04-01	0
1969-07-01	0
1969-10-01	0
1970-01-01	0
1970-04-01	0
1970-07-01	0
1970-10-01	0
1971-01-01	0
1971-04-01	0
1971-07-01	0
1971-10-01	0
1972-01-01	0
1972-04-01	0
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
1975-04-01	0
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	8
1976-07-01	34
1976-10-01	89
1977-01-01	109
1977-04-01	103
1977-07-01	102
1977-10-01	68
1978-01-01	90
1978-04-01	139
1978-07-01	231
1978-10-01	450
1979-01-01	509
1979-04-01	496
1979-07-01	480
1979-10-01	369
1980-01-01	250
1980-04-01	306
1980-07-01	388
1980-10-01	316
1981-01-01	453
1981-04-01	506
1981-07-01	596
1981-10-01	644
1982-01-01	665
1982-04-01	599
1982-07-01	452
1982-10-01	618
1983-01-01	435
1983-04-01	548
1983-07-01	628
1983-10-01	632
1984-01-01	1005
1984-04-01	874
1984-07-01	801
1984-10-01	1290
1985-01-01	1097
1985-04-01	1116
1985-07-01	1386
1985-10-01	1093
1986-01-01	1461
1986-04-01	1865
1986-07-01	2482
1986-10-01	2638
1987-01-01	2820
1987-04-01	2811
1987-07-01	2718
1987-10-01	2621
1988-01-01	2219
1988-04-01	2381
1988-07-01	1971
1988-10-01	2153
1989-01-01	2186
1989-04-01	1726
1989-07-01	2075
1989-10-01	2240
1990-01-01	2211
1990-04-01	2576
1990-07-01	2382
1990-10-01	2518
1991-01-01	2762
1991-04-01	3255
1991-07-01	3371
1991-10-01	4347
1992-01-01	4794
1992-04-01	4890
1992-07-01	5706
1992-10-01	5124
1993-01-01	5878
1993-04-01	5990
1993-07-01	6808
1993-10-01	6304
1994-01-01	4209
1994-04-01	5645
1994-07-01	6740
1994-10-01	6354
1995-01-01	7145
1995-04-01	5687
1995-07-01	5712
1995-10-01	7383
1996-01-01	8866
1996-04-01	7484
1996-07-01	5921
1996-10-01	6571
1997-01-01	7161
1997-04-01	7181
1997-07-01	7466
1997-10-01	7050
1998-01-01	6180
1998-04-01	7453
1998-07-01	10782
1998-10-01	13457
1999-01-01	12580
1999-04-01	12570
1999-07-01	12048
1999-10-01	11673
2000-01-01	14804
2000-04-01	14752
2000-07-01	16183
2000-10-01	13653
2001-01-01	15351
2001-04-01	13746
2001-07-01	13329
2001-10-01	14509
2002-01-01	16698
2002-04-01	18770
2002-07-01	16233
2002-10-01	15991
2003-01-01	17740
2003-04-01	16604
2003-07-01	14627
2003-10-01	15915
2004-01-01	21277
2004-04-01	22978
2004-07-01	28690
2004-10-01	29992
2005-01-01	34917
2005-04-01	33587
2005-07-01	30738
2005-10-01	29644
2006-01-01	31252
2006-04-01	38515
2006-07-01	34936
2006-10-01	34228
2007-01-01	43091
2007-04-01	56351
2007-07-01	61313
2007-10-01	42878
2008-01-01	51097
2008-04-01	50026
2008-07-01	51141
2008-10-01	59610
2009-01-01	61772
2009-04-01	57242
2009-07-01	52376
2009-10-01	50338
2010-01-01	56269
2010-04-01	56103
2010-07-01	59969
2010-10-01	60779
2011-01-01	76134
2011-04-01	65771
2011-07-01	78148
2011-10-01	69719
2012-01-01	63100
2012-04-01	59974
2012-07-01	53907
2012-10-01	62010
2013-01-01	72333
2013-04-01	67156
2013-07-01	71033
2013-10-01	66258
2014-01-01	56328
2014-04-01	51455
2014-07-01	50352
2014-10-01	47050
2015-01-01	43912
2015-04-01	46748
2015-07-01	48310
2015-10-01	45948
2016-01-01	52264
2016-04-01	45354
2016-07-01	53022
2016-10-01	46420
2017-01-01	46569
2017-04-01	43828
2017-07-01	30333
2017-10-01	32269
2018-01-01	32068
2018-04-01	35724