Quarter	Millions of US Dollars
1971-01-01	58
1971-04-01	111
1971-07-01	114
1971-10-01	135
1972-01-01	234
1972-04-01	235
1972-07-01	284
1972-10-01	363
1973-01-01	449
1973-04-01	610
1973-07-01	613
1973-10-01	642
1974-01-01	681
1974-04-01	677
1974-07-01	702
1974-10-01	742
1975-01-01	793
1975-04-01	1003
1975-07-01	1030
1975-10-01	1095
1976-01-01	1150
1976-04-01	1204
1976-07-01	1242
1976-10-01	1329
1977-01-01	1347
1977-04-01	1378
1977-07-01	1433
1977-10-01	1644
1978-01-01	1794
1978-04-01	1978
1978-07-01	2227
1978-10-01	2341
1979-01-01	2397
1979-04-01	2394
1979-07-01	2549
1979-10-01	2522
1980-01-01	2319
1980-04-01	2354
1980-07-01	2323
1980-10-01	2165
1981-01-01	2117
1981-04-01	2000
1981-07-01	2029
1981-10-01	2069
1982-01-01	2014
1982-04-01	2040
1982-07-01	1911
1982-10-01	2098
1983-01-01	2237
1983-04-01	2301
1983-07-01	2240
1983-10-01	2144
1984-01-01	2196
1984-04-01	2183
1984-07-01	2146
1984-10-01	2099
1985-01-01	2174
1985-04-01	2491
1985-07-01	2744
1985-10-01	2394
1986-01-01	2364
1986-04-01	2423
1986-07-01	2593
1986-10-01	2558
1987-01-01	2556
1987-04-01	2521
1987-07-01	2463
1987-10-01	2586
1988-01-01	2370
1988-04-01	2076
1988-07-01	1956
1988-10-01	2006
1989-01-01	1863
1989-04-01	1695
1989-07-01	1722
1989-10-01	1801
1990-01-01	1761
1990-04-01	1313
1990-07-01	1160
1990-10-01	1079
1991-01-01	868
1991-04-01	809
1991-07-01	714
1991-10-01	764
1992-01-01	685
1992-04-01	884
1992-07-01	870
1992-10-01	667
1993-01-01	667
1993-04-01	435
1993-07-01	1951
1993-10-01	1929
1994-01-01	1941
1994-04-01	1957
1994-07-01	1968
1994-10-01	1967
1995-01-01	2007
1995-04-01	2007
1995-07-01	2019
1995-10-01	2404
1996-01-01	2382
1996-04-01	2497
1996-07-01	2407
1996-10-01	4180
1997-01-01	4149
1997-04-01	4040
1997-07-01	4422
1997-10-01	4811
1998-01-01	5153
1998-04-01	5536
1998-07-01	5972
1998-10-01	6069
1999-01-01	6731
1999-04-01	6728
1999-07-01	6932
1999-10-01	7381
2000-01-01	7620
2000-04-01	8192
2000-07-01	8476
2000-10-01	8401
2001-01-01	8279
2001-04-01	8564
2001-07-01	8688
2001-10-01	8506
2002-01-01	8524
2002-04-01	8696
2002-07-01	8388
2002-10-01	8473
2003-01-01	8584
2003-04-01	8711
2003-07-01	8797
2003-10-01	8950
2004-01-01	10274
2004-04-01	10478
2004-07-01	10356
2004-10-01	10775
2005-01-01	10510
2005-04-01	9827
2005-07-01	12524
2005-10-01	12275
2006-01-01	14755
2006-04-01	15840
2006-07-01	18063
2006-10-01	21803
2007-01-01	21667
2007-04-01	27077
2007-07-01	30776
2007-10-01	33999
2008-01-01	36139
2008-04-01	40000
2008-07-01	40303
2008-10-01	39896
2009-01-01	39453
2009-04-01	40770
2009-07-01	48763
2009-10-01	48452
2010-01-01	47988
2010-04-01	48902
2010-07-01	50780
2010-10-01	53180
2011-01-01	57308
2011-04-01	56176
2011-07-01	55071
2011-10-01	61288
2012-01-01	64519
2012-04-01	64445
2012-07-01	65744
2012-10-01	67491
2013-01-01	66476
2013-04-01	64995
2013-07-01	65303
2013-10-01	63929
2014-01-01	64746
2014-04-01	71523
2014-07-01	66801
2014-10-01	71180
2015-01-01	72631
2015-04-01	75105
2015-07-01	74802
2015-10-01	78361
2016-01-01	78768
2016-04-01	77574
2016-07-01	77414
2016-10-01	75722
2017-01-01	74897
2017-04-01	75388
2017-07-01	75923
2017-10-01	79999
2018-01-01	78527
2018-04-01	79172