Quarter	Millions of US Dollars
1971-01-01	43
1971-04-01	72
1971-07-01	105
1971-10-01	107
1972-01-01	110
1972-04-01	142
1972-07-01	140
1972-10-01	140
1973-01-01	156
1973-04-01	196
1973-07-01	239
1973-10-01	250
1974-01-01	295
1974-04-01	384
1974-07-01	378
1974-10-01	582
1975-01-01	1004
1975-04-01	1410
1975-07-01	1554
1975-10-01	2033
1976-01-01	2832
1976-04-01	3568
1976-07-01	3844
1976-10-01	4280
1977-01-01	4832
1977-04-01	5459
1977-07-01	5881
1977-10-01	6681
1978-01-01	7369
1978-04-01	7988
1978-07-01	9453
1978-10-01	10281
1979-01-01	11345
1979-04-01	12651
1979-07-01	14251
1979-10-01	14379
1980-01-01	13491
1980-04-01	15040
1980-07-01	15682
1980-10-01	15999
1981-01-01	15649
1981-04-01	15450
1981-07-01	17411
1981-10-01	19196
1982-01-01	19507
1982-04-01	19522
1982-07-01	20311
1982-10-01	22852
1983-01-01	24766
1983-04-01	27311
1983-07-01	28852
1983-10-01	31090
1984-01-01	35444
1984-04-01	36763
1984-07-01	38434
1984-10-01	40177
1985-01-01	45262
1985-04-01	48978
1985-07-01	57519
1985-10-01	63407
1986-01-01	69704
1986-04-01	80256
1986-07-01	90439
1986-10-01	99200
1987-01-01	110653
1987-04-01	120911
1987-07-01	134622
1987-10-01	151416
1988-01-01	153066
1988-04-01	154649
1988-07-01	168984
1988-10-01	181437
1989-01-01	194591
1989-04-01	222472
1989-07-01	240248
1989-10-01	263671
1990-01-01	275568
1990-04-01	280185
1990-07-01	304395
1990-10-01	317358
1991-01-01	317351
1991-04-01	323072
1991-07-01	342510
1991-10-01	360548
1992-01-01	352363
1992-04-01	361807
1992-07-01	367818
1992-10-01	354086
1993-01-01	343605
1993-04-01	330147
1993-07-01	345591
1993-10-01	333768
1994-01-01	344542
1994-04-01	350664
1994-07-01	354316
1994-10-01	347073
1995-01-01	373932
1995-04-01	381187
1995-07-01	347262
1995-10-01	343209
1996-01-01	338971
1996-04-01	336685
1996-07-01	340989
1996-10-01	335476
1997-01-01	325141
1997-04-01	334663
1997-07-01	333779
1997-10-01	313120
1998-01-01	300783
1998-04-01	286363
1998-07-01	290041
1998-10-01	314158
1999-01-01	303549
1999-04-01	302696
1999-07-01	333231
1999-10-01	329124
2000-01-01	313507
2000-04-01	308913
2000-07-01	293413
2000-10-01	280428
2001-01-01	261210
2001-04-01	262258
2001-07-01	263319
2001-10-01	249141
2002-01-01	239662
2002-04-01	261194
2002-07-01	251481
2002-10-01	246314
2003-01-01	243910
2003-04-01	242225
2003-07-01	249653
2003-10-01	265665
2004-01-01	274545
2004-04-01	276958
2004-07-01	276198
2004-10-01	292335
2005-01-01	287812
2005-04-01	275074
2005-07-01	274539
2005-10-01	264885
2006-01-01	278037
2006-04-01	292412
2006-07-01	295892
2006-10-01	307198
2007-01-01	315350
2007-04-01	320335
2007-07-01	332981
2007-10-01	350193
2008-01-01	379121
2008-04-01	378332
2008-07-01	363628
2008-10-01	380856
2009-01-01	359698
2009-04-01	363738
2009-07-01	380917
2009-10-01	370647
2010-01-01	361680
2010-04-01	344618
2010-07-01	375611
2010-10-01	377279
2011-01-01	380295
2011-04-01	372077
2011-07-01	371961
2011-10-01	363480
2012-01-01	372366
2012-04-01	369707
2012-07-01	388708
2012-10-01	374442
2013-01-01	367626
2013-04-01	368857
2013-07-01	391155
2013-10-01	395900
2014-01-01	400293
2014-04-01	416680
2014-07-01	418404
2014-10-01	414206
2015-01-01	409642
2015-04-01	415284
2015-07-01	423569
2015-10-01	436148
2016-01-01	461165
2016-04-01	475650
2016-07-01	479185
2016-10-01	468364
2017-01-01	493216
2017-04-01	511170
2017-07-01	559425
2017-10-01	575538
2018-01-01	585252
2018-04-01	583391