Quarter	Millions of US Dollars
1966-07-01	15
1966-10-01	15
1967-01-01	30
1967-04-01	30
1967-07-01	30
1967-10-01	30
1968-01-01	30
1968-04-01	30
1968-07-01	30
1968-10-01	30
1969-01-01	30
1969-04-01	30
1969-07-01	30
1969-10-01	30
1970-01-01	30
1970-04-01	30
1970-07-01	30
1970-10-01	30
1971-01-01	30
1971-04-01	31
1971-07-01	32
1971-10-01	32
1972-01-01	32
1972-04-01	54
1972-07-01	74
1972-10-01	130
1973-01-01	174
1973-04-01	234
1973-07-01	256
1973-10-01	279
1974-01-01	336
1974-04-01	365
1974-07-01	411
1974-10-01	613
1975-01-01	731
1975-04-01	825
1975-07-01	781
1975-10-01	826
1976-01-01	907
1976-04-01	916
1976-07-01	975
1976-10-01	1103
1977-01-01	1109
1977-04-01	1223
1977-07-01	1289
1977-10-01	1517
1978-01-01	1717
1978-04-01	1893
1978-07-01	2222
1978-10-01	2195
1979-01-01	2101
1979-04-01	2178
1979-07-01	2308
1979-10-01	2152
1980-01-01	1912
1980-04-01	2242
1980-07-01	2268
1980-10-01	2212
1981-01-01	2157
1981-04-01	2126
1981-07-01	2145
1981-10-01	2302
1982-01-01	2202
1982-04-01	2167
1982-07-01	2196
1982-10-01	2455
1983-01-01	2358
1983-04-01	2345
1983-07-01	2396
1983-10-01	2218
1984-01-01	2252
1984-04-01	2145
1984-07-01	2049
1984-10-01	1982
1985-01-01	1953
1985-04-01	1969
1985-07-01	2265
1985-10-01	2309
1986-01-01	2409
1986-04-01	2719
1986-07-01	2982
1986-10-01	3034
1987-01-01	3262
1987-04-01	3054
1987-07-01	2840
1987-10-01	3493
1988-01-01	3205
1988-04-01	2617
1988-07-01	2509
1988-10-01	2628
1989-01-01	2410
1989-04-01	2311
1989-07-01	2279
1989-10-01	2336
1990-01-01	2300
1990-04-01	2383
1990-07-01	2593
1990-10-01	2612
1991-01-01	2405
1991-04-01	2304
1991-07-01	2464
1991-10-01	2704
1992-01-01	2411
1992-04-01	2584
1992-07-01	2766
1992-10-01	2270
1993-01-01	2222
1993-04-01	2224
1993-07-01	2376
1993-10-01	2417
1994-01-01	2796
1994-04-01	2795
1994-07-01	2922
1994-10-01	3076
1995-01-01	3507
1995-04-01	3702
1995-07-01	3561
1995-10-01	3178
1996-01-01	3050
1996-04-01	2903
1996-07-01	2783
1996-10-01	2612
1997-01-01	2380
1997-04-01	2318
1997-07-01	2243
1997-10-01	2169
1998-01-01	2081
1998-04-01	2193
1998-07-01	2418
1998-10-01	2742
1999-01-01	2636
1999-04-01	2534
1999-07-01	2723
1999-10-01	2582
2000-01-01	2879
2000-04-01	2877
2000-07-01	2650
2000-10-01	2783
2001-01-01	2607
2001-04-01	2471
2001-07-01	2690
2001-10-01	2762
2002-01-01	2734
2002-04-01	3366
2002-07-01	3333
2002-10-01	3486
2003-01-01	3591
2003-04-01	3793
2003-07-01	4298
2003-10-01	7301
2004-01-01	7501
2004-04-01	7701
2004-07-01	7875
2004-10-01	9806
2005-01-01	11159
2005-04-01	11280
2005-07-01	10931
2005-10-01	13651
2006-01-01	14259
2006-04-01	15240
2006-07-01	15204
2006-10-01	17018
2007-01-01	18522
2007-04-01	20484
2007-07-01	21536
2007-10-01	27305
2008-01-01	29284
2008-04-01	28725
2008-07-01	26002
2008-10-01	28722
2009-01-01	27766
2009-04-01	30139
2009-07-01	34535
2009-10-01	34081
2010-01-01	31692
2010-04-01	31338
2010-07-01	35898
2010-10-01	35798
2011-01-01	38735
2011-04-01	40553
2011-07-01	39655
2011-10-01	39058
2012-01-01	40675
2012-04-01	40261
2012-07-01	43177
2012-10-01	43861
2013-01-01	44033
2013-04-01	46207
2013-07-01	50346
2013-10-01	51969
2014-01-01	49148
2014-04-01	49042
2014-07-01	44720
2014-10-01	44872
2015-01-01	39682
2015-04-01	41119
2015-07-01	42616
2015-10-01	40625
2016-01-01	42406
2016-04-01	41056
2016-07-01	41769
2016-10-01	38427
2017-01-01	38951
2017-04-01	41224
2017-07-01	43909
2017-10-01	45392
2018-01-01	46400
2018-04-01	44410