Quarter	Millions of US Dollars
1989-10-01	146776
1990-01-01	155487
1990-04-01	164159
1990-07-01	180066
1990-10-01	188326
1991-01-01	169995
1991-04-01	164491
1991-07-01	183357
1991-10-01	200780
1992-01-01	198290
1992-04-01	225242
1992-07-01	256862
1992-10-01	230506
1993-01-01	234863
1993-04-01	227080
1993-07-01	228983
1993-10-01	218245
1994-01-01	229289
1994-04-01	247746
1994-07-01	256682
1994-10-01	272200
1995-01-01	312191
1995-04-01	317660
1995-07-01	317134
1995-10-01	314852
1996-01-01	313036
1996-04-01	306816
1996-07-01	310828
1996-10-01	302938
1997-01-01	285763
1997-04-01	278322
1997-07-01	275790
1997-10-01	269811
1998-01-01	263623
1998-04-01	271236
1998-07-01	291498
1998-10-01	289081
1999-01-01	273738
1999-04-01	261356
1999-07-01	273729
1999-10-01	251031
2000-01-01	248968
2000-04-01	246263
2000-07-01	229107
2000-10-01	235417
2001-01-01	229130
2001-04-01	223978
2001-07-01	243335
2001-10-01	229070
2002-01-01	230933
2002-04-01	261361
2002-07-01	259246
2002-10-01	276352
2003-01-01	281631
2003-04-01	304776
2003-07-01	311830
2003-10-01	328638
2004-01-01	327655
2004-04-01	324205
2004-07-01	333443
2004-10-01	351175
2005-01-01	341673
2005-04-01	321951
2005-07-01	319132
2005-10-01	308960
2006-01-01	327760
2006-04-01	337073
2006-07-01	335559
2006-10-01	343228
2007-01-01	352863
2007-04-01	367701
2007-07-01	395040
2007-10-01	398583
2008-01-01	429853
2008-04-01	438797
2008-07-01	394531
2008-10-01	408332
2009-01-01	402932
2009-04-01	432824
2009-07-01	453859
2009-10-01	442468
2010-01-01	429790
2010-04-01	396786
2010-07-01	438753
2010-10-01	437997
2011-01-01	476309
2011-04-01	486784
2011-07-01	457157
2011-10-01	451059
2012-01-01	470960
2012-04-01	454053
2012-07-01	461843
2012-10-01	465402
2013-01-01	461629
2013-04-01	479499
2013-07-01	484711
2013-10-01	492455
2014-01-01	504362
2014-04-01	508384
2014-07-01	462467
2014-10-01	442090
2015-01-01	402114
2015-04-01	422418
2015-07-01	421136
2015-10-01	405850
2016-01-01	434924
2016-04-01	436011
2016-07-01	436917
2016-10-01	409565
2017-01-01	426580
2017-04-01	453598
2017-07-01	475645
2017-10-01	472755
2018-01-01	498382