Quarter	Millions of US Dollars
1967-04-01	25
1967-07-01	25
1967-10-01	25
1968-01-01	25
1968-04-01	55
1968-07-01	55
1968-10-01	75
1969-01-01	75
1969-04-01	75
1969-07-01	75
1969-10-01	125
1970-01-01	152
1970-04-01	153
1970-07-01	153
1970-10-01	152
1971-01-01	205
1971-04-01	290
1971-07-01	293
1971-10-01	294
1972-01-01	296
1972-04-01	296
1972-07-01	295
1972-10-01	345
1973-01-01	353
1973-04-01	365
1973-07-01	365
1973-10-01	356
1974-01-01	361
1974-04-01	360
1974-07-01	356
1974-10-01	368
1975-01-01	383
1975-04-01	392
1975-07-01	373
1975-10-01	375
1976-01-01	376
1976-04-01	374
1976-07-01	379
1976-10-01	383
1977-01-01	408
1977-04-01	500
1977-07-01	504
1977-10-01	603
1978-01-01	642
1978-04-01	751
1978-07-01	789
1978-10-01	792
1979-01-01	816
1979-04-01	871
1979-07-01	995
1979-10-01	1028
1980-01-01	1177
1980-04-01	1566
1980-07-01	1834
1980-10-01	1944
1981-01-01	2158
1981-04-01	2145
1981-07-01	2157
1981-10-01	2722
1982-01-01	3481
1982-04-01	3525
1982-07-01	3586
1982-10-01	4350
1983-01-01	4392
1983-04-01	4430
1983-07-01	4538
1983-10-01	5302
1984-01-01	5733
1984-04-01	5656
1984-07-01	6046
1984-10-01	7190
1985-01-01	8293
1985-04-01	9931
1985-07-01	11182
1985-10-01	12115
1986-01-01	12100
1986-04-01	13626
1986-07-01	14728
1986-10-01	14874
1987-01-01	17093
1987-04-01	17723
1987-07-01	18095
1987-10-01	22871
1988-01-01	22788
1988-04-01	22711
1988-07-01	23534
1988-10-01	24502
1989-01-01	23348
1989-04-01	23361
1989-07-01	23963
1989-10-01	25043
1990-01-01	25404
1990-04-01	28910
1990-07-01	32306
1990-10-01	33486
1991-01-01	39142
1991-04-01	39327
1991-07-01	41033
1991-10-01	44694
1992-01-01	43553
1992-04-01	47035
1992-07-01	45867
1992-10-01	41060
1993-01-01	40473
1993-04-01	41720
1993-07-01	46141
1993-10-01	45636
1994-01-01	48895
1994-04-01	49733
1994-07-01	54074
1994-10-01	56136
1995-01-01	57809
1995-04-01	64500
1995-07-01	62740
1995-10-01	63108
1996-01-01	61081
1996-04-01	63099
1996-07-01	63344
1996-10-01	63594
1997-01-01	61742
1997-04-01	64991
1997-07-01	65946
1997-10-01	63737
1998-01-01	63237
1998-04-01	67076
1998-07-01	69527
1998-10-01	76091
1999-01-01	71476
1999-04-01	79365
1999-07-01	82504
1999-10-01	92179
2000-01-01	99817
2000-04-01	114745
2000-07-01	117966
2000-10-01	131006
2001-01-01	136733
2001-04-01	142741
2001-07-01	156173
2001-10-01	170571
2002-01-01	178790
2002-04-01	204324
2002-07-01	211004
2002-10-01	236661
2003-01-01	266185
2003-04-01	286746
2003-07-01	301127
2003-10-01	338510
2004-01-01	360141
2004-04-01	388228
2004-07-01	404122
2004-10-01	464430
2005-01-01	470119
2005-04-01	471110
2005-07-01	458439
2005-10-01	476585
2006-01-01	513306
2006-04-01	558372
2006-07-01	580305
2006-10-01	627681
2007-01-01	662444
2007-04-01	722787
2007-07-01	749042
2007-10-01	782514
2008-01-01	861430
2008-04-01	891770
2008-07-01	811166
2008-10-01	863270
2009-01-01	863782
2009-04-01	932225
2009-07-01	983713
2009-10-01	1000137
2010-01-01	938868
2010-04-01	858878
2010-07-01	983704
2010-10-01	976953
2011-01-01	1053923
2011-04-01	1078253
2011-07-01	1017754
2011-10-01	981270
2012-01-01	980119
2012-04-01	903755
2012-07-01	928114
2012-10-01	938622
2013-01-01	892670
2013-04-01	910427
2013-07-01	957618
2013-10-01	993606
2014-01-01	985801
2014-04-01	982068
2014-07-01	887971
2014-10-01	860431
2015-01-01	771579
2015-04-01	799089
2015-07-01	790017
2015-10-01	764931
2016-01-01	778771
2016-04-01	771837
2016-07-01	765522
2016-10-01	725495
2017-01-01	744237
2017-04-01	803419
2017-07-01	833101
2017-10-01	851570
2018-01-01	878478
2018-04-01	837885