Quarter	Millions of US Dollars
1967-04-01	25
1967-07-01	25
1967-10-01	25
1968-01-01	25
1968-04-01	25
1968-07-01	25
1968-10-01	25
1969-01-01	25
1969-04-01	25
1969-07-01	25
1969-10-01	25
1970-01-01	25
1970-04-01	25
1970-07-01	25
1970-10-01	25
1971-01-01	39
1971-04-01	39
1971-07-01	39
1971-10-01	39
1972-01-01	84
1972-04-01	106
1972-07-01	205
1972-10-01	284
1973-01-01	330
1973-04-01	373
1973-07-01	370
1973-10-01	350
1974-01-01	357
1974-04-01	359
1974-07-01	356
1974-10-01	394
1975-01-01	424
1975-04-01	425
1975-07-01	473
1975-10-01	604
1976-01-01	661
1976-04-01	741
1976-07-01	980
1976-10-01	1057
1977-01-01	1166
1977-04-01	1227
1977-07-01	1283
1977-10-01	1535
1978-01-01	1791
1978-04-01	1874
1978-07-01	2299
1978-10-01	2412
1979-01-01	2494
1979-04-01	2605
1979-07-01	2781
1979-10-01	2722
1980-01-01	2571
1980-04-01	3135
1980-07-01	3323
1980-10-01	3268
1981-01-01	3279
1981-04-01	3042
1981-07-01	3234
1981-10-01	3485
1982-01-01	3548
1982-04-01	3545
1982-07-01	3333
1982-10-01	3717
1983-01-01	3710
1983-04-01	3862
1983-07-01	3826
1983-10-01	4597
1984-01-01	5608
1984-04-01	5710
1984-07-01	6654
1984-10-01	7001
1985-01-01	7267
1985-04-01	8000
1985-07-01	7968
1985-10-01	7869
1986-01-01	7945
1986-04-01	8915
1986-07-01	11839
1986-10-01	13577
1987-01-01	16741
1987-04-01	16582
1987-07-01	16720
1987-10-01	18168
1988-01-01	17622
1988-04-01	17267
1988-07-01	16886
1988-10-01	16239
1989-01-01	15190
1989-04-01	14739
1989-07-01	14780
1989-10-01	15773
1990-01-01	16881
1990-04-01	16623
1990-07-01	18180
1990-10-01	18197
1991-01-01	16391
1991-04-01	15842
1991-07-01	15609
1991-10-01	14504
1992-01-01	11061
1992-04-01	11193
1992-07-01	11683
1992-10-01	11432
1993-01-01	12834
1993-04-01	14074
1993-07-01	20957
1993-10-01	20873
1994-01-01	20510
1994-04-01	19769
1994-07-01	19914
1994-10-01	19456
1995-01-01	19876
1995-04-01	19889
1995-07-01	18813
1995-10-01	18502
1996-01-01	17619
1996-04-01	17455
1996-07-01	17188
1996-10-01	17463
1997-01-01	17419
1997-04-01	17512
1997-07-01	17125
1997-10-01	16124
1998-01-01	15029
1998-04-01	13978
1998-07-01	14029
1998-10-01	13369
1999-01-01	12747
1999-04-01	12233
1999-07-01	13366
1999-10-01	12175
2000-01-01	10905
2000-04-01	10687
2000-07-01	10427
2000-10-01	10798
2001-01-01	10114
2001-04-01	10312
2001-07-01	10223
2001-10-01	9443
2002-01-01	8882
2002-04-01	8835
2002-07-01	8773
2002-10-01	7742
2003-01-01	7389
2003-04-01	9464
2003-07-01	8685
2003-10-01	8229
2004-01-01	7826
2004-04-01	7332
2004-07-01	6923
2004-10-01	6942
2005-01-01	9044
2005-04-01	7894
2005-07-01	7191
2005-10-01	7063
2006-01-01	7153
2006-04-01	7402
2006-07-01	7370
2006-10-01	6567
2007-01-01	6588
2007-04-01	6652
2007-07-01	6859
2007-10-01	6926
2008-01-01	7330
2008-04-01	7306
2008-07-01	6066
2008-10-01	12101
2009-01-01	16143
2009-04-01	22386
2009-07-01	22397
2009-10-01	21909
2010-01-01	21483
2010-04-01	18742
2010-07-01	19664
2010-10-01	19053
2011-01-01	25658
2011-04-01	26459
2011-07-01	28274
2011-10-01	21953
2012-01-01	19592
2012-04-01	17371
2012-07-01	17501
2012-10-01	17550
2013-01-01	12067
2013-04-01	13759
2013-07-01	14080
2013-10-01	14203
2014-01-01	12666
2014-04-01	12154
2014-07-01	11447
2014-10-01	11115
2015-01-01	10369
2015-04-01	9290
2015-07-01	8882
2015-10-01	7146
2016-01-01	4436
2016-04-01	3083
2016-07-01	2759
2016-10-01	2810