Quarter	Millions of US Dollars
1989-10-01	21950
1990-01-01	53156
1990-04-01	57060
1990-07-01	62445
1990-10-01	62765
1991-01-01	59119
1991-04-01	58137
1991-07-01	62257
1991-10-01	68434
1992-01-01	64894
1992-04-01	68959
1992-07-01	66673
1992-10-01	56872
1993-01-01	56326
1993-04-01	49755
1993-07-01	47823
1993-10-01	44859
1994-01-01	46649
1994-04-01	48928
1994-07-01	49725
1994-10-01	48063
1995-01-01	48027
1995-04-01	50283
1995-07-01	48504
1995-10-01	49772
1996-01-01	47398
1996-04-01	45852
1996-07-01	46442
1996-10-01	45833
1997-01-01	42122
1997-04-01	42807
1997-07-01	41044
1997-10-01	40477
1998-01-01	38863
1998-04-01	43387
1998-07-01	44678
1998-10-01	47847
1999-01-01	49296
1999-04-01	52275
1999-07-01	61730
1999-10-01	69524
2000-01-01	64546
2000-04-01	65645
2000-07-01	60605
2000-10-01	65330
2001-01-01	67115
2001-04-01	67030
2001-07-01	76972
2001-10-01	82342
2002-01-01	87940
2002-04-01	102355
2002-07-01	108435
2002-10-01	131058
2003-01-01	154560
2003-04-01	174102
2003-07-01	194151
2003-10-01	250470
2004-01-01	274051
2004-04-01	301392
2004-07-01	338485
2004-10-01	434184
2005-01-01	473394
2005-04-01	507949
2005-07-01	534499
2005-10-01	587280
2006-01-01	683894
2006-04-01	792970
2006-07-01	841291
2006-10-01	950497
2007-01-01	1062839
2007-04-01	1162895
2007-07-01	1265707
2007-10-01	1384562
2008-01-01	1478571
2008-04-01	1577733
2008-07-01	1433480
2008-10-01	1414163
2009-01-01	1402457
2009-04-01	1531953
2009-07-01	1587625
2009-10-01	1553691
2010-01-01	1443491
2010-04-01	1284592
2010-07-01	1457549
2010-10-01	1441976
2011-01-01	1545508
2011-04-01	1546095
2011-07-01	1436223
2011-10-01	1414054
2012-01-01	1512082
2012-04-01	1408263
2012-07-01	1405059
2012-10-01	1430017
2013-01-01	1343999
2013-04-01	1282183
2013-07-01	1262478
2013-10-01	1227417
2014-01-01	1156298
2014-04-01	1111528
2014-07-01	985340
2014-10-01	939449
2015-01-01	807960
2015-04-01	815380
2015-07-01	803936
2015-10-01	769580
2016-01-01	777099
2016-04-01	763175
2016-07-01	752549
2016-10-01	710231
2017-01-01	701853
2017-04-01	750937
2017-07-01	769355
2017-10-01	785522
2018-01-01	801714