Quarter	Millions of US Dollars
1972-04-01	25
1972-07-01	25
1972-10-01	25
1973-01-01	58
1973-04-01	82
1973-07-01	83
1973-10-01	77
1974-01-01	80
1974-04-01	80
1974-07-01	79
1974-10-01	83
1975-01-01	85
1975-04-01	84
1975-07-01	78
1975-10-01	79
1976-01-01	80
1976-04-01	83
1976-07-01	93
1976-10-01	95
1977-01-01	94
1977-04-01	95
1977-07-01	139
1977-10-01	148
1978-01-01	153
1978-04-01	223
1978-07-01	237
1978-10-01	292
1979-01-01	382
1979-04-01	379
1979-07-01	437
1979-10-01	427
1980-01-01	394
1980-04-01	410
1980-07-01	410
1980-10-01	401
1981-01-01	383
1981-04-01	353
1981-07-01	354
1981-10-01	373
1982-01-01	656
1982-04-01	682
1982-07-01	670
1982-10-01	1005
1983-01-01	1059
1983-04-01	1265
1983-07-01	2112
1983-10-01	2214
1984-01-01	2553
1984-04-01	2514
1984-07-01	2630
1984-10-01	3204
1985-01-01	3210
1985-04-01	4069
1985-07-01	4234
1985-10-01	5393
1986-01-01	5536
1986-04-01	5676
1986-07-01	5798
1986-10-01	5857
1987-01-01	6042
1987-04-01	6104
1987-07-01	6186
1987-10-01	6612
1988-01-01	6719
1988-04-01	6155
1988-07-01	6150
1988-10-01	6323
1989-01-01	6272
1989-04-01	5868
1989-07-01	5855
1989-10-01	6082
1990-01-01	5993
1990-04-01	6064
1990-07-01	6478
1990-10-01	6410
1991-01-01	6177
1991-04-01	6334
1991-07-01	6489
1991-10-01	6682
1992-01-01	6377
1992-04-01	6492
1992-07-01	6664
1992-10-01	5359
1993-01-01	5444
1993-04-01	5527
1993-07-01	4854
1993-10-01	4892
1994-01-01	5046
1994-04-01	5230
1994-07-01	5047
1994-10-01	5183
1995-01-01	5443
1995-04-01	4985
1995-07-01	6353
1995-10-01	6652
1996-01-01	6934
1996-04-01	7190
1996-07-01	7285
1996-10-01	9188
1997-01-01	9476
1997-04-01	11703
1997-07-01	12249
1997-10-01	12482
1998-01-01	11946
1998-04-01	11886
1998-07-01	11767
1998-10-01	12051
1999-01-01	12832
1999-04-01	13684
1999-07-01	14668
1999-10-01	14621
2000-01-01	14465
2000-04-01	14567
2000-07-01	14772
2000-10-01	15752
2001-01-01	15661
2001-04-01	16190
2001-07-01	17451
2001-10-01	17196
2002-01-01	18335
2002-04-01	21214
2002-07-01	21581
2002-10-01	22861
2003-01-01	22818
2003-04-01	22948
2003-07-01	22349
2003-10-01	22908
2004-01-01	24622
2004-04-01	24619
2004-07-01	26383
2004-10-01	28452
2005-01-01	28167
2005-04-01	29105
2005-07-01	29497
2005-10-01	28480
2006-01-01	29734
2006-04-01	30085
2006-07-01	30674
2006-10-01	31435
2007-01-01	31743
2007-04-01	31147
2007-07-01	31549
2007-10-01	31870
2008-01-01	33248
2008-04-01	32756
2008-07-01	32949
2008-10-01	32351
2009-01-01	31237
2009-04-01	29496
2009-07-01	34329
2009-10-01	33151
2010-01-01	33643
2010-04-01	36030
2010-07-01	39006
2010-10-01	39935
2011-01-01	39955
2011-04-01	40555
2011-07-01	41210
2011-10-01	41260
2012-01-01	44912
2012-04-01	48952
2012-07-01	51831
2012-10-01	50625
2013-01-01	49496
2013-04-01	52061
2013-07-01	52408
2013-10-01	53995
2014-01-01	54611
2014-04-01	55444
2014-07-01	53595
2014-10-01	55211
2015-01-01	59071
2015-04-01	60226
2015-07-01	59500
2015-10-01	60045
2016-01-01	61588
2016-04-01	64359
2016-07-01	63060
2016-10-01	63839
2017-01-01	64637
2017-04-01	63550
2017-07-01	62732
2017-10-01	64104
2018-01-01	63767
2018-04-01	61379