Quarter	Millions of US Dollars
1971-10-01	31
1972-01-01	113
1972-04-01	153
1972-07-01	204
1972-10-01	349
1973-01-01	456
1973-04-01	499
1973-07-01	575
1973-10-01	669
1974-01-01	683
1974-04-01	678
1974-07-01	671
1974-10-01	757
1975-01-01	930
1975-04-01	1076
1975-07-01	1102
1975-10-01	1166
1976-01-01	1235
1976-04-01	1428
1976-07-01	1579
1976-10-01	1860
1977-01-01	2178
1977-04-01	2817
1977-07-01	3718
1977-10-01	4850
1978-01-01	6186
1978-04-01	6912
1978-07-01	7741
1978-10-01	8435
1979-01-01	8766
1979-04-01	9026
1979-07-01	9740
1979-10-01	9912
1980-01-01	9264
1980-04-01	10548
1980-07-01	10801
1980-10-01	10786
1981-01-01	10569
1981-04-01	10719
1981-07-01	11203
1981-10-01	12393
1982-01-01	12469
1982-04-01	12169
1982-07-01	11958
1982-10-01	12369
1983-01-01	11779
1983-04-01	11492
1983-07-01	11388
1983-10-01	11070
1984-01-01	11122
1984-04-01	10622
1984-07-01	9982
1984-10-01	9752
1985-01-01	9678
1985-04-01	9609
1985-07-01	10106
1985-10-01	9452
1986-01-01	9607
1986-04-01	9509
1986-07-01	9667
1986-10-01	8985
1987-01-01	9370
1987-04-01	8794
1987-07-01	8604
1987-10-01	8924
1988-01-01	8631
1988-04-01	7519
1988-07-01	6506
1988-10-01	6520
1989-01-01	6119
1989-04-01	5794
1989-07-01	6748
1989-10-01	6246
1990-01-01	41440
1990-04-01	42416
1990-07-01	43739
1990-10-01	61000
1991-01-01	60454
1991-04-01	61388
1991-07-01	63150
1991-10-01	67282
1992-01-01	68095
1992-04-01	70879
1992-07-01	73718
1992-10-01	76244
1993-01-01	77860
1993-04-01	101616
1993-07-01	108312
1993-10-01	124134
1994-01-01	131967
1994-04-01	175178
1994-07-01	178351
1994-10-01	180930
1995-01-01	181887
1995-04-01	184525
1995-07-01	190444
1995-10-01	195361
1996-01-01	202722
1996-04-01	211024
1996-07-01	221386
1996-10-01	230571
1997-01-01	243396
1997-04-01	257674
1997-07-01	268928
1997-10-01	267104
1998-01-01	275581
1998-04-01	288761
1998-07-01	292772
1998-10-01	271557
1999-01-01	267489
1999-04-01	278839
1999-07-01	285177
1999-10-01	290692
2000-01-01	301921
2000-04-01	301987
2000-07-01	311469
2000-10-01	309193
2001-01-01	316284
2001-04-01	309186
2001-07-01	313250
2001-10-01	306339
2002-01-01	305472
2002-04-01	308157
2002-07-01	304901
2002-10-01	308361
2003-01-01	304837
2003-04-01	305188
2003-07-01	305791
2003-10-01	313209
2004-01-01	315192
2004-04-01	308070
2004-07-01	308088
2004-10-01	318055
2005-01-01	320467
2005-04-01	287394
2005-07-01	288544
2005-10-01	293035
2006-01-01	296937
2006-04-01	282169
2006-07-01	287350
2006-10-01	295945
2007-01-01	298094
2007-04-01	313854
2007-07-01	316597
2007-10-01	322578
2008-01-01	322615
2008-04-01	323325
2008-07-01	312300
2008-10-01	297738
2009-01-01	296287
2009-04-01	300451
2009-07-01	315803
2009-10-01	341076
2010-01-01	349728
2010-04-01	362198
2010-07-01	385562
2010-10-01	401719
2011-01-01	422978
2011-04-01	441392
2011-07-01	445742
2011-10-01	462077
2012-01-01	479142
2012-04-01	483220
2012-07-01	505214
2012-10-01	522408
2013-01-01	532452
2013-04-01	545842
2013-07-01	565033
2013-10-01	589087
2014-01-01	598893
2014-04-01	625489
2014-07-01	639643
2014-10-01	641026
2015-01-01	643657
2015-04-01	663749
2015-07-01	661398
2015-10-01	658454
2016-01-01	685444
2016-04-01	706247
2016-07-01	719235
2016-10-01	731668
2017-01-01	755904
2017-04-01	780832
2017-07-01	808095
2017-10-01	820227
2018-01-01	851061
2018-04-01	844201