Quarter	Millions of US Dollars
1971-10-01	15
1972-01-01	15
1972-04-01	15
1972-07-01	15
1972-10-01	15
1973-01-01	15
1973-04-01	15
1973-07-01	91
1973-10-01	90
1974-01-01	142
1974-04-01	142
1974-07-01	142
1974-10-01	147
1975-01-01	171
1975-04-01	171
1975-07-01	168
1975-10-01	169
1976-01-01	171
1976-04-01	172
1976-07-01	172
1976-10-01	173
1977-01-01	172
1977-04-01	280
1977-07-01	303
1977-10-01	311
1978-01-01	313
1978-04-01	313
1978-07-01	267
1978-10-01	265
1979-01-01	259
1979-04-01	256
1979-07-01	259
1979-10-01	260
1980-01-01	256
1980-04-01	261
1980-07-01	259
1980-10-01	255
1981-01-01	251
1981-04-01	245
1981-07-01	232
1981-10-01	297
1982-01-01	293
1982-04-01	292
1982-07-01	307
1982-10-01	345
1983-01-01	341
1983-04-01	334
1983-07-01	322
1983-10-01	376
1984-01-01	376
1984-04-01	376
1984-07-01	362
1984-10-01	437
1985-01-01	479
1985-04-01	416
1985-07-01	377
1985-10-01	410
1986-01-01	417
1986-04-01	389
1986-07-01	495
1986-10-01	531
1987-01-01	705
1987-04-01	912
1987-07-01	962
1987-10-01	1042
1988-01-01	1295
1988-04-01	1391
1988-07-01	1361
1988-10-01	1378
1989-01-01	1503
1989-04-01	1611
1989-07-01	1579
1989-10-01	1518
1990-01-01	1410
1990-04-01	1497
1990-07-01	1696
1990-10-01	1585
1991-01-01	1633
1991-04-01	1644
1991-07-01	1829
1991-10-01	1783
1992-01-01	1901
1992-04-01	2073
1992-07-01	2158
1992-10-01	2166
1993-01-01	2092
1993-04-01	2581
1993-07-01	4383
1993-10-01	7032
1994-01-01	9229
1994-04-01	10074
1994-07-01	11190
1994-10-01	13141
1995-01-01	13376
1995-04-01	13160
1995-07-01	13063
1995-10-01	13824
1996-01-01	15566
1996-04-01	14546
1996-07-01	15649
1996-10-01	16170
1997-01-01	17925
1997-04-01	20492
1997-07-01	23584
1997-10-01	23081
1998-01-01	23222
1998-04-01	22932
1998-07-01	22553
1998-10-01	21889
1999-01-01	24628
1999-04-01	24494
1999-07-01	25396
1999-10-01	24899
2000-01-01	25727
2000-04-01	25577
2000-07-01	29948
2000-10-01	30115
2001-01-01	33515
2001-04-01	37218
2001-07-01	37237
2001-10-01	38349
2002-01-01	39727
2002-04-01	40785
2002-07-01	40671
2002-10-01	40630
2003-01-01	42664
2003-04-01	43766
2003-07-01	43814
2003-10-01	48857
2004-01-01	48227
2004-04-01	47485
2004-07-01	48843
2004-10-01	50764
2005-01-01	52082
2005-04-01	53767
2005-07-01	55869
2005-10-01	56341
2006-01-01	56483
2006-04-01	57915
2006-07-01	58881
2006-10-01	62472
2007-01-01	62801
2007-04-01	66428
2007-07-01	65697
2007-10-01	66358
2008-01-01	66728
2008-04-01	68828
2008-07-01	69485
2008-10-01	67544
2009-01-01	65687
2009-04-01	69063
2009-07-01	75138
2009-10-01	78298
2010-01-01	78465
2010-04-01	77833
2010-07-01	83086
2010-10-01	85836
2011-01-01	83361
2011-04-01	86686
2011-07-01	86112
2011-10-01	86167
2012-01-01	99419
2012-04-01	107235
2012-07-01	110327
2012-10-01	114179
2013-01-01	115256
2013-04-01	120793
2013-07-01	119270
2013-10-01	121141
2014-01-01	127049
2014-04-01	128942
2014-07-01	129221
2014-10-01	133072
2015-01-01	134517
2015-04-01	134015
2015-07-01	130057
2015-10-01	130773
2016-01-01	132366
2016-04-01	137415
2016-07-01	138954
2016-10-01	142482
2017-01-01	141796
2017-04-01	148513
2017-07-01	158049
2017-10-01	160224
2018-01-01	163247
2018-04-01	164933