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	121
1971-04-01	10
1971-07-01	82
1971-10-01	76
1972-01-01	310
1972-04-01	675
1972-07-01	417
1972-10-01	526
1973-01-01	213
1973-04-01	618
1973-07-01	298
1973-10-01	858
1974-01-01	427
1974-04-01	659
1974-07-01	327
1974-10-01	716
1975-01-01	1094
1975-04-01	1784
1975-07-01	892
1975-10-01	1338
1976-01-01	1106
1976-04-01	1364
1976-07-01	1717
1976-10-01	1555
1977-01-01	2330
1977-04-01	2358
1977-07-01	1883
1977-10-01	2616
1978-01-01	4124
1978-04-01	3426
1978-07-01	1643
1978-10-01	2896
1979-01-01	3400
1979-04-01	1797
1979-07-01	1520
1979-10-01	2195
1980-01-01	1758
1980-04-01	1627
1980-07-01	1240
1980-10-01	427
1981-01-01	549
1981-04-01	1719
1981-07-01	1103
1981-10-01	2698
1982-01-01	3681
1982-04-01	1251
1982-07-01	2228
1982-10-01	1806
1983-01-01	2017
1983-04-01	653
1983-07-01	1456
1983-10-01	4861
1984-01-01	3338
1984-04-01	2869
1984-07-01	4501
1984-10-01	8018
1985-01-01	1079
1985-04-01	7658
1985-07-01	2263
1985-10-01	2570
1986-01-01	4841
1986-04-01	5129
1986-07-01	6528
1986-10-01	5111
1987-01-01	4218
1987-04-01	1048
1987-07-01	-379
1987-10-01	3421
1988-01-01	2709
1988-04-01	1369
1988-07-01	1302
1988-10-01	-2414
1989-01-01	526
1989-04-01	-572
1989-07-01	621
1989-10-01	-511
1990-01-01	36127
1990-04-01	1806
1990-07-01	2249
1990-10-01	15746
1991-01-01	12481
1991-04-01	4148
1991-07-01	2209
1991-10-01	2906
1992-01-01	6098
1992-04-01	7865
1992-07-01	5373
1992-10-01	18815
1993-01-01	25412
1993-04-01	29505
1993-07-01	28650
1993-10-01	17199
1994-01-01	19373
1994-04-01	52160
1994-07-01	29780
1994-10-01	18711
1995-01-01	16579
1995-04-01	15609
1995-07-01	16489
1995-10-01	2323
1996-01-01	14878
1996-04-01	11737
1996-07-01	16787
1996-10-01	10926
1997-01-01	17650
1997-04-01	20259
1997-07-01	12041
1997-10-01	-8877
1998-01-01	12520
1998-04-01	19649
1998-07-01	9334
1998-10-01	-20626
1999-01-01	2536
1999-04-01	18213
1999-07-01	-7540
1999-10-01	8584
2000-01-01	19254
2000-04-01	6949
2000-07-01	33221
2000-10-01	-4743
2001-01-01	22409
2001-04-01	3956
2001-07-01	1795
2001-10-01	7120
2002-01-01	36021
2002-04-01	-9102
2002-07-01	6399
2002-10-01	4454
2003-01-01	31589
2003-04-01	28452
2003-07-01	8617
2003-10-01	-232
2004-01-01	29981
2004-04-01	21208
2004-07-01	3255
2004-10-01	6609
2005-01-01	33015
2005-04-01	2278
2005-07-01	-8775
2005-10-01	20472
2006-01-01	39647
2006-04-01	2837
2006-07-01	-4640
2006-10-01	5162
2007-01-01	30211
2007-04-01	43771
2007-07-01	-5470
2007-10-01	-39049
2008-01-01	21593
2008-04-01	33748
2008-07-01	-21805
2008-10-01	13850
2009-01-01	41720
2009-04-01	57873
2009-07-01	14540
2009-10-01	14890
2010-01-01	53578
2010-04-01	33787
2010-07-01	38103
2010-10-01	21180
2011-01-01	29010
2011-04-01	18625
2011-07-01	9704
2011-10-01	9488
2012-01-01	-23599
2012-04-01	24087
2012-07-01	-15900
2012-10-01	52000
2013-01-01	-5623
2013-04-01	-8881
2013-07-01	35446
2013-10-01	8917
2014-01-01	543
2014-04-01	35791
2014-07-01	13633
2014-10-01	11341
2015-01-01	-1741
2015-04-01	-2992
2015-07-01	10604
2015-10-01	-19724
2016-01-01	4746
2016-04-01	43568
2016-07-01	-10531
2016-10-01	74158
2017-01-01	29408
2017-04-01	55038
2017-07-01	29567
2017-10-01	33816
2018-01-01	49722
2018-04-01	37849