Quarter	Millions of US Dollars
1972-01-01	26
1972-04-01	27
1972-07-01	26
1972-10-01	27
1973-01-01	31
1973-04-01	34
1973-07-01	33
1973-10-01	31
1974-01-01	53
1974-04-01	77
1974-07-01	92
1974-10-01	131
1975-01-01	197
1975-04-01	259
1975-07-01	272
1975-10-01	311
1976-01-01	387
1976-04-01	497
1976-07-01	508
1976-10-01	561
1977-01-01	560
1977-04-01	576
1977-07-01	608
1977-10-01	707
1978-01-01	802
1978-04-01	802
1978-07-01	930
1978-10-01	909
1979-01-01	875
1979-04-01	826
1979-07-01	854
1979-10-01	813
1980-01-01	714
1980-04-01	770
1980-07-01	755
1980-10-01	721
1981-01-01	659
1981-04-01	652
1981-07-01	757
1981-10-01	835
1982-01-01	739
1982-04-01	665
1982-07-01	655
1982-10-01	710
1983-01-01	682
1983-04-01	632
1983-07-01	596
1983-10-01	562
1984-01-01	623
1984-04-01	615
1984-07-01	592
1984-10-01	570
1985-01-01	720
1985-04-01	734
1985-07-01	881
1985-10-01	991
1986-01-01	1058
1986-04-01	1030
1986-07-01	1113
1986-10-01	1182
1987-01-01	1285
1987-04-01	1280
1987-07-01	1263
1987-10-01	1431
1988-01-01	1356
1988-04-01	1244
1988-07-01	1140
1988-10-01	1207
1989-01-01	1054
1989-04-01	1003
1989-07-01	1040
1989-10-01	1071
1990-01-01	1007
1990-04-01	1009
1990-07-01	1063
1990-10-01	1023
1991-01-01	882
1991-04-01	775
1991-07-01	841
1991-10-01	889
1992-01-01	815
1992-04-01	916
1992-07-01	926
1992-10-01	828
1993-01-01	828
1993-04-01	800
1993-07-01	1254
1993-10-01	1116
1994-01-01	1140
1994-04-01	1596
1994-07-01	1773
1994-10-01	2191
1995-01-01	2025
1995-04-01	2205
1995-07-01	1579
1995-10-01	2312
1996-01-01	2571
1996-04-01	2545
1996-07-01	2099
1996-10-01	2419
1997-01-01	2547
1997-04-01	3647
1997-07-01	2903
1997-10-01	3840
1998-01-01	3357
1998-04-01	3013
1998-07-01	3872
1998-10-01	3876
1999-01-01	3928
1999-04-01	4542
1999-07-01	4183
1999-10-01	7303
2000-01-01	9333
2000-04-01	12651
2000-07-01	15610
2000-10-01	26698
2001-01-01	22781
2001-04-01	25571
2001-07-01	24824
2001-10-01	22538
2002-01-01	21869
2002-04-01	31534
2002-07-01	32634
2002-10-01	33210
2003-01-01	42115
2003-04-01	45540
2003-07-01	42241
2003-10-01	43762
2004-01-01	45539
2004-04-01	46915
2004-07-01	50864
2004-10-01	53996
2005-01-01	53425
2005-04-01	50495
2005-07-01	40569
2005-10-01	46264
2006-01-01	51260
2006-04-01	67602
2006-07-01	65415
2006-10-01	63225
2007-01-01	65392
2007-04-01	73049
2007-07-01	76853
2007-10-01	74497
2008-01-01	81216
2008-04-01	89001
2008-07-01	82789
2008-10-01	78568
2009-01-01	69964
2009-04-01	84002
2009-07-01	92216
2009-10-01	96165
2010-01-01	94710
2010-04-01	91276
2010-07-01	104741
2010-10-01	100946
2011-01-01	112178
2011-04-01	123052
2011-07-01	117307
2011-10-01	108057
2012-01-01	113840
2012-04-01	120293
2012-07-01	126097
2012-10-01	135117
2013-01-01	139226
2013-04-01	154325
2013-07-01	158628
2013-10-01	167575
2014-01-01	174359
2014-04-01	172108
2014-07-01	163804
2014-10-01	166740
2015-01-01	151887
2015-04-01	167966
2015-07-01	168375
2015-10-01	159151
2016-01-01	178768
2016-04-01	179958
2016-07-01	180224
2016-10-01	176123
2017-01-01	179745
2017-04-01	187522
2017-07-01	199574
2017-10-01	201086
2018-01-01	207624
2018-04-01	202580