Quarter	Millions of US Dollars
1987-01-01	424891
1987-04-01	422644
1987-07-01	439139
1987-10-01	507488
1988-01-01	535723
1988-04-01	478657
1988-07-01	474701
1988-10-01	517722
1989-01-01	502760
1989-04-01	453014
1989-07-01	479843
1989-10-01	484203
1990-01-01	587251
1990-04-01	626099
1990-07-01	690022
1990-10-01	722777
1991-01-01	692307
1991-04-01	655290
1991-07-01	708533
1991-10-01	745730
1992-01-01	670103
1992-04-01	759958
1992-07-01	738366
1992-10-01	689267
1993-01-01	694006
1993-04-01	734986
1993-07-01	763379
1993-10-01	806727
1994-01-01	797110
1994-04-01	816734
1994-07-01	860286
1994-10-01	879344
1995-01-01	926794
1995-04-01	968174
1995-07-01	988543
1995-10-01	1033844
1996-01-01	1042926
1996-04-01	1082589
1996-07-01	1126122
1996-10-01	1252646
1997-01-01	1225108
1997-04-01	1294966
1997-07-01	1319727
1997-10-01	1379624
1998-01-01	1444226
1998-04-01	1432155
1998-07-01	1519450
1998-10-01	1524112
1999-01-01	1540126
1999-04-01	1522027
1999-07-01	1579191
1999-10-01	1623424
2000-01-01	1618562
2000-04-01	1587086
2000-07-01	1577275
2000-10-01	1668269
2001-01-01	1653864
2001-04-01	1612804
2001-07-01	1693062
2001-10-01	1701344
2002-01-01	1706947
2002-04-01	1857900
2002-07-01	1947614
2002-10-01	2057335
2003-01-01	2063927
2003-04-01	2217977
2003-07-01	2321936
2003-10-01	2497389
2004-01-01	2678985
2004-04-01	2650692
2004-07-01	2742108
2004-10-01	3026835
2005-01-01	3055142
2005-04-01	3072753
2005-07-01	3116866
2005-10-01	3156022
2006-01-01	3318981
2006-04-01	3499939
2006-07-01	3718229
2006-10-01	3989602
2007-01-01	4093000
2007-04-01	4299040
2007-07-01	4595061
2007-10-01	4706491
2008-01-01	4800314
2008-04-01	4822360
2008-07-01	4534948
2008-10-01	4099646
2009-01-01	4113359
2009-04-01	4898806
2009-07-01	5272723
2009-10-01	5280693
2010-01-01	5067167
2010-04-01	4981849
2010-07-01	5556637
2010-10-01	5210005
2011-01-01	5506241
2011-04-01	5596626
2011-07-01	5550104
2011-10-01	5586967
2012-01-01	5767580
2012-04-01	5634913
2012-07-01	5843440
2012-10-01	5929135
2013-01-01	5621735
2013-04-01	5544350
2013-07-01	5724250
2013-10-01	5851259
2014-01-01	5966316
2014-04-01	6233799
2014-07-01	6103196
2014-10-01	6169945
2015-01-01	5968701
2015-04-01	6145343
2015-07-01	6014490
2015-10-01	5891075
2016-01-01	5803048
2016-04-01	5807854
2016-07-01	5862836
2016-10-01	5427469
2017-01-01	5519933
2017-04-01	5693968
2017-07-01	5833132
2017-10-01	6014332
2018-01-01	6219230