Quarter	Millions of US Dollars
1989-10-01	50675
1990-01-01	51123
1990-04-01	50534
1990-07-01	53689
1990-10-01	55757
1991-01-01	49258
1991-04-01	46321
1991-07-01	50749
1991-10-01	55545
1992-01-01	50253
1992-04-01	52637
1992-07-01	48334
1992-10-01	39288
1993-01-01	35388
1993-04-01	35068
1993-07-01	34052
1993-10-01	31139
1994-01-01	33995
1994-04-01	35833
1994-07-01	36302
1994-10-01	33804
1995-01-01	30183
1995-04-01	30293
1995-07-01	30712
1995-10-01	31212
1996-01-01	32777
1996-04-01	33890
1996-07-01	33292
1996-10-01	33199
1997-01-01	30378
1997-04-01	28974
1997-07-01	29049
1997-10-01	28259
1998-01-01	26489
1998-04-01	25048
1998-07-01	26383
1998-10-01	26056
1999-01-01	20481
1999-04-01	19151
1999-07-01	19775
1999-10-01	20917
2000-01-01	20167
2000-04-01	20914
2000-07-01	20285
2000-10-01	19893
2001-01-01	20055
2001-04-01	22652
2001-07-01	27170
2001-10-01	26008
2002-01-01	27800
2002-04-01	34186
2002-07-01	35680
2002-10-01	39406
2003-01-01	41340
2003-04-01	44831
2003-07-01	41616
2003-10-01	48508
2004-01-01	48977
2004-04-01	60990
2004-07-01	61446
2004-10-01	68173
2005-01-01	65671
2005-04-01	61125
2005-07-01	60537
2005-10-01	59787
2006-01-01	60683
2006-04-01	68430
2006-07-01	68760
2006-10-01	71271
2007-01-01	70481
2007-04-01	82296
2007-07-01	85640
2007-10-01	94559
2008-01-01	100674
2008-04-01	98465
2008-07-01	91093
2008-10-01	87503
2009-01-01	88746
2009-04-01	100814
2009-07-01	108494
2009-10-01	111864
2010-01-01	114148
2010-04-01	105823
2010-07-01	118802
2010-10-01	120626
2011-01-01	128583
2011-04-01	127571
2011-07-01	119058
2011-10-01	116854
2012-01-01	126559
2012-04-01	119853
2012-07-01	130447
2012-10-01	137201
2013-01-01	137813
2013-04-01	142887
2013-07-01	159298
2013-10-01	172280
2014-01-01	176944
2014-04-01	173113
2014-07-01	163626
2014-10-01	159299
2015-01-01	144217
2015-04-01	144907
2015-07-01	146157
2015-10-01	141360
2016-01-01	137180
2016-04-01	138312
2016-07-01	141507
2016-10-01	130829
2017-01-01	137614
2017-04-01	149455
2017-07-01	158382
2017-10-01	173445
2018-01-01	174202