Quarter	Millions of US Dollars
1962-10-01	6
1966-01-01	15
1967-04-01	25
1968-04-01	5
1969-01-01	27
1969-04-01	15
1970-07-01	75
1971-01-01	96
1971-04-01	10
1971-07-01	57
1971-10-01	46
1972-01-01	176
1972-04-01	488
1972-07-01	345
1972-10-01	259
1973-01-01	148
1973-04-01	446
1973-07-01	206
1973-10-01	430
1974-01-01	317
1974-04-01	278
1974-07-01	288
1974-10-01	618
1975-01-01	930
1975-04-01	1655
1975-07-01	846
1975-10-01	1313
1976-01-01	995
1976-04-01	1186
1976-07-01	1630
1976-10-01	1320
1977-01-01	1956
1977-04-01	1881
1977-07-01	1585
1977-10-01	2050
1978-01-01	3058
1978-04-01	2863
1978-07-01	1256
1978-10-01	2213
1979-01-01	2818
1979-04-01	1607
1979-07-01	1141
1979-10-01	2013
1980-01-01	1833
1980-04-01	1362
1980-07-01	914
1980-10-01	353
1981-01-01	540
1981-04-01	1523
1981-07-01	970
1981-10-01	2442
1982-01-01	3277
1982-04-01	1439
1982-07-01	2000
1982-10-01	1444
1983-01-01	2415
1983-04-01	463
1983-07-01	165
1983-10-01	4866
1984-01-01	2965
1984-04-01	2825
1984-07-01	4407
1984-10-01	7285
1985-01-01	1092
1985-04-01	6818
1985-07-01	2294
1985-10-01	2291
1986-01-01	4693
1986-04-01	5207
1986-07-01	6703
1986-10-01	5617
1987-01-01	4601
1987-04-01	1191
1987-07-01	-150
1987-10-01	3659
1988-01-01	2631
1988-04-01	1828
1988-07-01	1356
1988-10-01	-3094
1989-01-01	621
1989-04-01	-323
1989-07-01	-655
1989-10-01	-418
1990-01-01	1781
1990-04-01	1627
1990-07-01	2405
1990-10-01	605
1991-01-01	12213
1991-04-01	2685
1991-07-01	2116
1991-10-01	1954
1992-01-01	3419
1992-04-01	7803
1992-07-01	4071
1992-10-01	15769
1993-01-01	24131
1993-04-01	11166
1993-07-01	28490
1993-10-01	4856
1994-01-01	16222
1994-04-01	10207
1994-07-01	22493
1994-10-01	11532
1995-01-01	11414
1995-04-01	13031
1995-07-01	10132
1995-10-01	-1916
1996-01-01	5787
1996-04-01	8230
1996-07-01	3043
1996-10-01	3674
1997-01-01	2034
1997-04-01	6681
1997-07-01	4867
1997-10-01	-12148
1998-01-01	3816
1998-04-01	1924
1998-07-01	1216
1998-10-01	1864
1999-01-01	-5091
1999-04-01	2874
1999-07-01	-10709
1999-10-01	-3695
2000-01-01	3445
2000-04-01	1715
2000-07-01	-6283
2000-10-01	-5050
2001-01-01	11267
2001-04-01	4815
2001-07-01	-1615
2001-10-01	10159
2002-01-01	27302
2002-04-01	-7112
2002-07-01	1722
2002-10-01	2105
2003-01-01	31511
2003-04-01	26989
2003-07-01	5416
2003-10-01	-3829
2004-01-01	21515
2004-04-01	13646
2004-07-01	-4081
2004-10-01	-5226
2005-01-01	20273
2005-04-01	17856
2005-07-01	-6164
2005-10-01	10052
2006-01-01	22813
2006-04-01	20317
2006-07-01	-8869
2006-10-01	-870
2007-01-01	23923
2007-04-01	42791
2007-07-01	-3633
2007-10-01	-42406
2008-01-01	28962
2008-04-01	21733
2008-07-01	-20067
2008-10-01	21752
2009-01-01	31545
2009-04-01	48466
2009-07-01	5678
2009-10-01	-5978
2010-01-01	40231
2010-04-01	18169
2010-07-01	23286
2010-10-01	7839
2011-01-01	17501
2011-04-01	8812
2011-07-01	-2942
2011-10-01	-5836
2012-01-01	-42344
2012-04-01	-6326
2012-07-01	-28996
2012-10-01	28806
2013-01-01	-5971
2013-04-01	-18058
2013-07-01	12398
2013-10-01	-23716
2014-01-01	-650
2014-04-01	25656
2014-07-01	-607
2014-10-01	3543
2015-01-01	-20906
2015-04-01	-7046
2015-07-01	954
2015-10-01	-18608
2016-01-01	-14142
2016-04-01	-17575
2016-07-01	-16913
2016-10-01	12026
2017-01-01	-13410
2017-04-01	10532
2017-07-01	210
2017-10-01	-10830
2018-01-01	6120
2018-04-01	-4300