Quarter	Millions of US Dollars
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	0
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	35
1979-04-01	35
1979-07-01	35
1979-10-01	35
1980-01-01	0
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	48
1981-04-01	42
1981-07-01	93
1981-10-01	94
1982-01-01	50
1982-04-01	50
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	57
1983-10-01	55
1984-01-01	58
1984-04-01	54
1984-07-01	0
1984-10-01	138
1985-01-01	141
1985-04-01	239
1985-07-01	270
1985-10-01	167
1986-01-01	220
1986-04-01	97
1986-07-01	267
1986-10-01	306
1987-01-01	274
1987-04-01	270
1987-07-01	146
1987-10-01	109
1988-01-01	104
1988-04-01	93
1988-07-01	104
1988-10-01	92
1989-01-01	175
1989-04-01	181
1989-07-01	127
1989-10-01	109
1990-01-01	25
1990-04-01	5
1990-07-01	9
1990-10-01	9
1991-01-01	79
1991-04-01	80
1991-07-01	275
1991-10-01	610
1992-01-01	788
1992-04-01	790
1992-07-01	820
1992-10-01	679
1993-01-01	439
1993-04-01	489
1993-07-01	886
1993-10-01	1187
1994-01-01	1164
1994-04-01	1335
1994-07-01	1337
1994-10-01	1004
1995-01-01	734
1995-04-01	799
1995-07-01	1170
1995-10-01	1535
1996-01-01	2368
1996-04-01	2791
1996-07-01	2832
1996-10-01	2484
1997-01-01	2251
1997-04-01	2590
1997-07-01	2711
1997-10-01	2978
1998-01-01	3470
1998-04-01	3645
1998-07-01	2937
1998-10-01	2299
1999-01-01	1355
1999-04-01	1064
1999-07-01	1354
1999-10-01	1467
2000-01-01	1727
2000-04-01	2315
2000-07-01	2302
2000-10-01	2299
2001-01-01	2405
2001-04-01	1662
2001-07-01	1605
2001-10-01	2082
2002-01-01	1680
2002-04-01	1351
2002-07-01	1669
2002-10-01	1145
2003-01-01	1090
2003-04-01	2349
2003-07-01	2911
2003-10-01	4652
2004-01-01	5153
2004-04-01	4905
2004-07-01	4381
2004-10-01	2714
2005-01-01	2215
2005-04-01	1319
2005-07-01	645
2005-10-01	1028
2006-01-01	1287
2006-04-01	2082
2006-07-01	2838
2006-10-01	2282
2007-01-01	2666
2007-04-01	2096
2007-07-01	1974
2007-10-01	2546
2008-01-01	2265
2008-04-01	2014
2008-07-01	1305
2008-10-01	727
2009-01-01	397
2009-04-01	466
2009-07-01	793
2009-10-01	747
2010-01-01	2020
2010-04-01	2435
2010-07-01	2131
2010-10-01	1981
2011-01-01	808
2011-04-01	311
2011-07-01	403
2011-10-01	850
2012-01-01	750
2012-04-01	700
2012-07-01	2260
2012-10-01	2110
2013-01-01	2560
2013-04-01	3594
2013-07-01	2121
2013-10-01	2139
2014-01-01	2725
2014-04-01	1570
2014-07-01	1325
2014-10-01	1759
2015-01-01	841
2015-04-01	1475
2015-07-01	2021
2015-10-01	1714
2016-01-01	2908
2016-04-01	2536
2016-07-01	1899
2016-10-01	2152
2017-01-01	1475
2017-04-01	4266
2017-07-01	4673
2017-10-01	3781
2018-01-01	3340
2018-04-01	1165