Quarter	Millions of US Dollars
1989-10-01	20858
1990-01-01	20214
1990-04-01	21878
1990-07-01	23954
1990-10-01	26429
1991-01-01	23428
1991-04-01	23712
1991-07-01	31685
1991-10-01	36408
1992-01-01	38624
1992-04-01	42728
1992-07-01	49506
1992-10-01	46713
1993-01-01	48865
1993-04-01	46509
1993-07-01	46769
1993-10-01	45692
1994-01-01	44987
1994-04-01	49658
1994-07-01	54958
1994-10-01	71807
1995-01-01	83128
1995-04-01	84462
1995-07-01	82312
1995-10-01	72980
1996-01-01	71378
1996-04-01	69326
1996-07-01	66832
1996-10-01	61783
1997-01-01	58843
1997-04-01	57569
1997-07-01	55833
1997-10-01	50408
1998-01-01	51843
1998-04-01	51362
1998-07-01	56193
1998-10-01	49435
1999-01-01	46366
1999-04-01	44281
1999-07-01	48012
1999-10-01	43995
2000-01-01	43343
2000-04-01	46352
2000-07-01	45578
2000-10-01	48765
2001-01-01	49982
2001-04-01	47449
2001-07-01	57171
2001-10-01	54262
2002-01-01	51557
2002-04-01	64692
2002-07-01	69120
2002-10-01	71578
2003-01-01	90288
2003-04-01	103632
2003-07-01	107596
2003-10-01	121223
2004-01-01	114986
2004-04-01	116990
2004-07-01	121943
2004-10-01	132834
2005-01-01	135106
2005-04-01	124658
2005-07-01	122883
2005-10-01	118246
2006-01-01	131233
2006-04-01	147932
2006-07-01	141569
2006-10-01	139024
2007-01-01	147355
2007-04-01	153294
2007-07-01	159095
2007-10-01	174281
2008-01-01	199402
2008-04-01	190043
2008-07-01	174396
2008-10-01	174777
2009-01-01	155264
2009-04-01	163596
2009-07-01	174506
2009-10-01	175071
2010-01-01	172957
2010-04-01	156612
2010-07-01	167983
2010-10-01	167994
2011-01-01	137224
2011-04-01	135369
2011-07-01	135934
2011-10-01	128987
2012-01-01	136925
2012-04-01	128274
2012-07-01	141309
2012-10-01	150385
2013-01-01	157628
2013-04-01	165227
2013-07-01	169927
2013-10-01	174828
2014-01-01	176418
2014-04-01	166158
2014-07-01	155674
2014-10-01	154747
2015-01-01	140984
2015-04-01	152126
2015-07-01	152821
2015-10-01	147241
2016-01-01	165854
2016-04-01	165649
2016-07-01	169730
2016-10-01	166464
2017-01-01	176921
2017-04-01	187170
2017-07-01	218300
2017-10-01	222411
2018-01-01	205045