Quarter	Millions of US Dollars
1971-04-01	10
1971-07-01	10
1971-10-01	10
1972-01-01	10
1972-04-01	10
1972-07-01	10
1972-10-01	10
1973-01-01	10
1973-04-01	10
1973-07-01	10
1973-10-01	10
1974-01-01	10
1974-04-01	10
1974-07-01	10
1974-10-01	10
1975-01-01	10
1975-04-01	10
1975-07-01	10
1975-10-01	10
1976-01-01	10
1976-04-01	10
1976-07-01	10
1976-10-01	10
1977-01-01	10
1977-04-01	10
1977-07-01	10
1977-10-01	10
1978-01-01	10
1978-04-01	10
1978-07-01	10
1978-10-01	10
1979-01-01	10
1979-04-01	10
1979-07-01	10
1979-10-01	10
1980-01-01	10
1980-04-01	10
1980-07-01	10
1980-10-01	10
1981-01-01	10
1981-04-01	10
1981-07-01	10
1981-10-01	10
1982-01-01	508
1982-04-01	490
1982-07-01	475
1982-10-01	1171
1983-01-01	1119
1983-04-01	1080
1983-07-01	1041
1983-10-01	1499
1984-01-01	1558
1984-04-01	1457
1984-07-01	1840
1984-10-01	2786
1985-01-01	2819
1985-04-01	3480
1985-07-01	4210
1985-10-01	4895
1986-01-01	4861
1986-04-01	5266
1986-07-01	5405
1986-10-01	5801
1987-01-01	6023
1987-04-01	6192
1987-07-01	6191
1987-10-01	10204
1988-01-01	10012
1988-04-01	9524
1988-07-01	10409
1988-10-01	10800
1989-01-01	10398
1989-04-01	10095
1989-07-01	10285
1989-10-01	9974
1990-01-01	9874
1990-04-01	12731
1990-07-01	14405
1990-10-01	14147
1991-01-01	18276
1991-04-01	17655
1991-07-01	18339
1991-10-01	19021
1992-01-01	17745
1992-04-01	18419
1992-07-01	18736
1992-10-01	17292
1993-01-01	20295
1993-04-01	22745
1993-07-01	28909
1993-10-01	28277
1994-01-01	31624
1994-04-01	32274
1994-07-01	36734
1994-10-01	39612
1995-01-01	42299
1995-04-01	49144
1995-07-01	47504
1995-10-01	47356
1996-01-01	46354
1996-04-01	48520
1996-07-01	49777
1996-10-01	49971
1997-01-01	48796
1997-04-01	51533
1997-07-01	52203
1997-10-01	50617
1998-01-01	51607
1998-04-01	53086
1998-07-01	53603
1998-10-01	57537
1999-01-01	53384
1999-04-01	56208
1999-07-01	56331
1999-10-01	55965
2000-01-01	60336
2000-04-01	68209
2000-07-01	65497
2000-10-01	66874
2001-01-01	71938
2001-04-01	69065
2001-07-01	70817
2001-10-01	72827
2002-01-01	79183
2002-04-01	82448
2002-07-01	84797
2002-10-01	89460
2003-01-01	101944
2003-04-01	103761
2003-07-01	112549
2003-10-01	121028
2004-01-01	132809
2004-04-01	139643
2004-07-01	138451
2004-10-01	146407
2005-01-01	144243
2005-04-01	141360
2005-07-01	141532
2005-10-01	138676
2006-01-01	140509
2006-04-01	147934
2006-07-01	148484
2006-10-01	143343
2007-01-01	144114
2007-04-01	153958
2007-07-01	152368
2007-10-01	153831
2008-01-01	163679
2008-04-01	162959
2008-07-01	129137
2008-10-01	124868
2009-01-01	122393
2009-04-01	126858
2009-07-01	126794
2009-10-01	131158
2010-01-01	126762
2010-04-01	124788
2010-07-01	145885
2010-10-01	146437
2011-01-01	151090
2011-04-01	155120
2011-07-01	150896
2011-10-01	142795
2012-01-01	148255
2012-04-01	139289
2012-07-01	141675
2012-10-01	138951
2013-01-01	134241
2013-04-01	134845
2013-07-01	136954
2013-10-01	137996
2014-01-01	138343
2014-04-01	137047
2014-07-01	121330
2014-10-01	117305
2015-01-01	101623
2015-04-01	104654
2015-07-01	104646
2015-10-01	96157
2016-01-01	97669
2016-04-01	97854
2016-07-01	91772
2016-10-01	92025
2017-01-01	92179
2017-04-01	104219
2017-07-01	107195
2017-10-01	102027
2018-01-01	102151
2018-04-01	95483