Quarter	Millions of US Dollars
1975-07-01	19
1975-10-01	19
1976-01-01	48
1976-04-01	47
1976-07-01	50
1976-10-01	52
1977-01-01	51
1977-04-01	52
1977-07-01	75
1977-10-01	79
1978-01-01	82
1978-04-01	80
1978-07-01	84
1978-10-01	88
1979-01-01	86
1979-04-01	86
1979-07-01	90
1979-10-01	91
1980-01-01	83
1980-04-01	90
1980-07-01	98
1980-10-01	93
1981-01-01	88
1981-04-01	81
1981-07-01	83
1981-10-01	85
1982-01-01	81
1982-04-01	80
1982-07-01	64
1982-10-01	67
1983-01-01	58
1983-04-01	56
1983-07-01	55
1983-10-01	54
1984-01-01	56
1984-04-01	53
1984-07-01	75
1984-10-01	74
1985-01-01	75
1985-04-01	75
1985-07-01	61
1985-10-01	103
1986-01-01	343
1986-04-01	352
1986-07-01	364
1986-10-01	523
1987-01-01	543
1987-04-01	605
1987-07-01	587
1987-10-01	619
1988-01-01	610
1988-04-01	597
1988-07-01	733
1988-10-01	669
1989-01-01	774
1989-04-01	710
1989-07-01	718
1989-10-01	702
1990-01-01	675
1990-04-01	645
1990-07-01	1068
1990-10-01	847
1991-01-01	896
1991-04-01	996
1991-07-01	954
1991-10-01	874
1992-01-01	840
1992-04-01	997
1992-07-01	1178
1992-10-01	997
1993-01-01	953
1993-04-01	897
1993-07-01	746
1993-10-01	728
1994-01-01	736
1994-04-01	879
1994-07-01	770
1994-10-01	1840
1995-01-01	2015
1995-04-01	2054
1995-07-01	1888
1995-10-01	1452
1996-01-01	1651
1996-04-01	1969
1996-07-01	2095
1996-10-01	2238
1997-01-01	2929
1997-04-01	3602
1997-07-01	3781
1997-10-01	4242
1998-01-01	4943
1998-04-01	4957
1998-07-01	6466
1998-10-01	7262
1999-01-01	8266
1999-04-01	8216
1999-07-01	10098
1999-10-01	8196
2000-01-01	7074
2000-04-01	7623
2000-07-01	8154
2000-10-01	10629
2001-01-01	10958
2001-04-01	10088
2001-07-01	7822
2001-10-01	6997
2002-01-01	6765
2002-04-01	7531
2002-07-01	7307
2002-10-01	7414
2003-01-01	7453
2003-04-01	7608
2003-07-01	7691
2003-10-01	8087
2004-01-01	7940
2004-04-01	9004
2004-07-01	9152
2004-10-01	9638
2005-01-01	9050
2005-04-01	8509
2005-07-01	8758
2005-10-01	10184
2006-01-01	10538
2006-04-01	12334
2006-07-01	12977
2006-10-01	13279
2007-01-01	14048
2007-04-01	15943
2007-07-01	15782
2007-10-01	16848
2008-01-01	17218
2008-04-01	19681
2008-07-01	18436
2008-10-01	17594
2009-01-01	15822
2009-04-01	17168
2009-07-01	18047
2009-10-01	18636
2010-01-01	18237
2010-04-01	18218
2010-07-01	19561
2010-10-01	20960
2011-01-01	21999
2011-04-01	21896
2011-07-01	21532
2011-10-01	22072
2012-01-01	24615
2012-04-01	24867
2012-07-01	26115
2012-10-01	26829
2013-01-01	28087
2013-04-01	25892
2013-07-01	31345
2013-10-01	37368
2014-01-01	37007
2014-04-01	45453
2014-07-01	46923
2014-10-01	51707
2015-01-01	49698
2015-04-01	53853
2015-07-01	56939
2015-10-01	55596
2016-01-01	55641
2016-04-01	56803
2016-07-01	57539
2016-10-01	55768
2017-01-01	70501
2017-04-01	71367
2017-07-01	80276
2017-10-01	77481
2018-01-01	81083
2018-04-01	84241