Quarter	Millions of US Dollars
1993-01-01	380
1993-04-01	399
1993-07-01	387
1993-10-01	354
1994-01-01	278
1994-04-01	454
1994-07-01	738
1994-10-01	980
1995-01-01	1222
1995-04-01	1501
1995-07-01	1521
1995-10-01	2147
1996-01-01	2982
1996-04-01	2967
1996-07-01	3030
1996-10-01	3193
1997-01-01	3271
1997-04-01	3339
1997-07-01	3423
1997-10-01	3523
1998-01-01	3487
1998-04-01	4024
1998-07-01	3922
1998-10-01	3800
1999-01-01	3133
1999-04-01	3497
1999-07-01	3907
1999-10-01	3731
2000-01-01	3988
2000-04-01	4077
2000-07-01	3801
2000-10-01	4122
2001-01-01	5196
2001-04-01	5270
2001-07-01	5327
2001-10-01	5440
2002-01-01	5937
2002-04-01	6390
2002-07-01	6376
2002-10-01	7706
2003-01-01	8137
2003-04-01	9196
2003-07-01	9381
2003-10-01	10961
2004-01-01	11888
2004-04-01	11828
2004-07-01	12694
2004-10-01	14878
2005-01-01	13116
2005-04-01	13739
2005-07-01	13569
2005-10-01	12444
2006-01-01	13143
2006-04-01	13867
2006-07-01	14229
2006-10-01	18918
2007-01-01	19069
2007-04-01	23500
2007-07-01	24220
2007-10-01	26111
2008-01-01	29286
2008-04-01	33358
2008-07-01	30192
2008-10-01	30452
2009-01-01	28013
2009-04-01	32677
2009-07-01	35806
2009-10-01	35285
2010-01-01	33604
2010-04-01	33309
2010-07-01	36795
2010-10-01	38855
2011-01-01	42542
2011-04-01	43963
2011-07-01	41145
2011-10-01	40285
2012-01-01	45323
2012-04-01	45816
2012-07-01	48014
2012-10-01	48666
2013-01-01	50207
2013-04-01	53925
2013-07-01	55154
2013-10-01	56763
2014-01-01	60564
2014-04-01	58907
2014-07-01	54745
2014-10-01	52318
2015-01-01	47336
2015-04-01	49952
2015-07-01	49494
2015-10-01	48407
2016-01-01	50424
2016-04-01	50912
2016-07-01	51632
2016-10-01	48658
2017-01-01	51229
2017-04-01	54267
2017-07-01	57019
2017-10-01	59040
2018-01-01	61220