Quarter	Millions of US Dollars
1971-01-01	45
1971-04-01	45
1971-07-01	65
1971-10-01	65
1972-01-01	147
1972-04-01	186
1972-07-01	206
1972-10-01	246
1973-01-01	265
1973-04-01	274
1973-07-01	353
1973-10-01	382
1974-01-01	439
1974-04-01	439
1974-07-01	435
1974-10-01	445
1975-01-01	471
1975-04-01	493
1975-07-01	476
1975-10-01	478
1976-01-01	480
1976-04-01	478
1976-07-01	484
1976-10-01	531
1977-01-01	664
1977-04-01	796
1977-07-01	899
1977-10-01	924
1978-01-01	935
1978-04-01	927
1978-07-01	946
1978-10-01	964
1979-01-01	954
1979-04-01	972
1979-07-01	993
1979-10-01	996
1980-01-01	956
1980-04-01	992
1980-07-01	1022
1980-10-01	996
1981-01-01	973
1981-04-01	933
1981-07-01	934
1981-10-01	948
1982-01-01	906
1982-04-01	900
1982-07-01	890
1982-10-01	902
1983-01-01	894
1983-04-01	882
1983-07-01	869
1983-10-01	914
1984-01-01	923
1984-04-01	908
1984-07-01	892
1984-10-01	884
1985-01-01	889
1985-04-01	827
1985-07-01	803
1985-10-01	500
1986-01-01	576
1986-04-01	568
1986-07-01	585
1986-10-01	547
1987-01-01	544
1987-04-01	904
1987-07-01	933
1987-10-01	982
1988-01-01	1012
1988-04-01	1027
1988-07-01	1056
1988-10-01	1140
1989-01-01	1218
1989-04-01	1267
1989-07-01	1388
1989-10-01	1438
1990-01-01	1478
1990-04-01	1582
1990-07-01	1485
1990-10-01	1449
1991-01-01	1444
1991-04-01	1560
1991-07-01	1423
1991-10-01	1434
1992-01-01	1434
1992-04-01	1377
1992-07-01	1562
1992-10-01	1534
1993-01-01	1954
1993-04-01	1729
1993-07-01	1818
1993-10-01	2177
1994-01-01	3377
1994-04-01	3396
1994-07-01	3423
1994-10-01	3782
1995-01-01	4064
1995-04-01	3867
1995-07-01	4454
1995-10-01	6449
1996-01-01	6842
1996-04-01	7373
1996-07-01	8968
1996-10-01	10351
1997-01-01	11123
1997-04-01	11424
1997-07-01	11240
1997-10-01	10943
1998-01-01	13004
1998-04-01	14452
1998-07-01	17092
1998-10-01	17967
1999-01-01	17777
1999-04-01	17563
1999-07-01	18698
1999-10-01	18414
2000-01-01	18922
2000-04-01	20497
2000-07-01	19178
2000-10-01	22297
2001-01-01	22714
2001-04-01	23408
2001-07-01	24513
2001-10-01	23655
2002-01-01	21956
2002-04-01	24066
2002-07-01	23481
2002-10-01	22599
2003-01-01	22069
2003-04-01	22005
2003-07-01	21238
2003-10-01	25690
2004-01-01	24838
2004-04-01	24956
2004-07-01	25843
2004-10-01	26922
2005-01-01	29946
2005-04-01	29857
2005-07-01	29710
2005-10-01	30628
2006-01-01	30549
2006-04-01	32765
2006-07-01	36039
2006-10-01	34429
2007-01-01	37728
2007-04-01	42181
2007-07-01	42174
2007-10-01	41282
2008-01-01	42807
2008-04-01	49002
2008-07-01	51063
2008-10-01	50144
2009-01-01	56734
2009-04-01	60185
2009-07-01	61881
2009-10-01	65014
2010-01-01	66338
2010-04-01	65703
2010-07-01	71443
2010-10-01	75580
2011-01-01	77885
2011-04-01	82066
2011-07-01	81271
2011-10-01	81403
2012-01-01	79967
2012-04-01	83835
2012-07-01	86355
2012-10-01	87461
2013-01-01	87978
2013-04-01	92797
2013-07-01	96335
2013-10-01	97024
2014-01-01	99655
2014-04-01	97842
2014-07-01	96779
2014-10-01	99247
2015-01-01	99435
2015-04-01	100213
2015-07-01	99450
2015-10-01	100097
2016-01-01	100656
2016-04-01	98738
2016-07-01	100745
2016-10-01	103666
2017-01-01	101588
2017-04-01	101767
2017-07-01	104194
2017-10-01	104618
2018-01-01	105978
2018-04-01	112675