Quarter	Millions of US Dollars
1972-10-01	50
1973-01-01	50
1973-04-01	50
1973-07-01	50
1973-10-01	50
1974-01-01	50
1974-04-01	67
1974-07-01	67
1974-10-01	67
1975-01-01	68
1975-04-01	67
1975-07-01	67
1975-10-01	67
1976-01-01	67
1976-04-01	67
1976-07-01	434
1976-10-01	446
1977-01-01	484
1977-04-01	521
1977-07-01	565
1977-10-01	574
1978-01-01	697
1978-04-01	705
1978-07-01	748
1978-10-01	829
1979-01-01	839
1979-04-01	862
1979-07-01	964
1979-10-01	950
1980-01-01	924
1980-04-01	969
1980-07-01	1044
1980-10-01	1046
1981-01-01	1026
1981-04-01	989
1981-07-01	984
1981-10-01	1062
1982-01-01	1043
1982-04-01	1029
1982-07-01	1010
1982-10-01	1060
1983-01-01	1034
1983-04-01	1029
1983-07-01	1032
1983-10-01	1034
1984-01-01	1028
1984-04-01	1002
1984-07-01	950
1984-10-01	940
1985-01-01	909
1985-04-01	911
1985-07-01	963
1985-10-01	936
1986-01-01	965
1986-04-01	1005
1986-07-01	933
1986-10-01	833
1987-01-01	870
1987-04-01	799
1987-07-01	788
1987-10-01	861
1988-01-01	742
1988-04-01	718
1988-07-01	682
1988-10-01	655
1989-01-01	582
1989-04-01	560
1989-07-01	498
1989-10-01	490
1990-01-01	468
1990-04-01	1313
1990-07-01	1250
1990-10-01	1254
1991-01-01	1248
1991-04-01	1251
1991-07-01	1258
1991-10-01	1150
1992-01-01	938
1992-04-01	942
1992-07-01	946
1992-10-01	4291
1993-01-01	4448
1993-04-01	4455
1993-07-01	4761
1993-10-01	5210
1994-01-01	5256
1994-04-01	5668
1994-07-01	5981
1994-10-01	6314
1995-01-01	6322
1995-04-01	6250
1995-07-01	6650
1995-10-01	6812
1996-01-01	6826
1996-04-01	7379
1996-07-01	7953
1996-10-01	9659
1997-01-01	10584
1997-04-01	11487
1997-07-01	12638
1997-10-01	12266
1998-01-01	13068
1998-04-01	13775
1998-07-01	13390
1998-10-01	13006
1999-01-01	14163
1999-04-01	14888
1999-07-01	15764
1999-10-01	16124
2000-01-01	17668
2000-04-01	17336
2000-07-01	17445
2000-10-01	17085
2001-01-01	16100
2001-04-01	16359
2001-07-01	16244
2001-10-01	17327
2002-01-01	18943
2002-04-01	20044
2002-07-01	20447
2002-10-01	21500
2003-01-01	22424
2003-04-01	23266
2003-07-01	23931
2003-10-01	25489
2004-01-01	25870
2004-04-01	25924
2004-07-01	26892
2004-10-01	26993
2005-01-01	28373
2005-04-01	28895
2005-07-01	29804
2005-10-01	28610
2006-01-01	31183
2006-04-01	30787
2006-07-01	32145
2006-10-01	31430
2007-01-01	32914
2007-04-01	33210
2007-07-01	32981
2007-10-01	32677
2008-01-01	33188
2008-04-01	31675
2008-07-01	31648
2008-10-01	31537
2009-01-01	31843
2009-04-01	32813
2009-07-01	34224
2009-10-01	35876
2010-01-01	36823
2010-04-01	36865
2010-07-01	37807
2010-10-01	38962
2011-01-01	40980
2011-04-01	42147
2011-07-01	41803
2011-10-01	40796
2012-01-01	43241
2012-04-01	43667
2012-07-01	43668
2012-10-01	44655
2013-01-01	43851
2013-04-01	45432
2013-07-01	44850
2013-10-01	45167
2014-01-01	44969
2014-04-01	45653
2014-07-01	44997
2014-10-01	44855
2015-01-01	47125
2015-04-01	47050
2015-07-01	47306
2015-10-01	47500
2016-01-01	48243
2016-04-01	47648
2016-07-01	47581
2016-10-01	46578
2017-01-01	45774
2017-04-01	45757
2017-07-01	47525
2017-10-01	46608
2018-01-01	50235
2018-04-01	50401