Quarter	Millions of US Dollars
1993-07-01	693
1993-10-01	693
1994-01-01	693
1994-04-01	693
1994-07-01	693
1994-10-01	693
1995-01-01	693
1995-04-01	693
1995-07-01	693
1995-10-01	693
1996-01-01	693
1996-04-01	693
1996-07-01	693
1996-10-01	893
1997-01-01	893
1997-04-01	893
1997-07-01	893
1997-10-01	1243
1998-01-01	1243
1998-04-01	1343
1998-07-01	1343
1998-10-01	1343
1999-01-01	1343
1999-04-01	1343
1999-07-01	1343
1999-10-01	1443
2000-01-01	1443
2000-04-01	1793
2000-07-01	1793
2000-10-01	1793
2001-01-01	1793
2001-04-01	1793
2001-07-01	1943
2001-10-01	1943
2002-01-01	2052
2002-04-01	2318
2002-07-01	2316
2002-10-01	2124
2003-01-01	2129
2003-04-01	2961
2003-07-01	2964
2003-10-01	2976
2004-01-01	3471
2004-04-01	3970
2004-07-01	3973
2004-10-01	5963
2005-01-01	6655
2005-04-01	7044
2005-07-01	7344
2005-10-01	9291
2006-01-01	11052
2006-04-01	13780
2006-07-01	16733
2006-10-01	19443
2007-01-01	24682
2007-04-01	28067
2007-07-01	28768
2007-10-01	29897
2008-01-01	30144
2008-04-01	30770
2008-07-01	34164
2008-10-01	33494
2009-01-01	32286
2009-04-01	32674
2009-07-01	34268
2009-10-01	34217
2010-01-01	34724
2010-04-01	34936
2010-07-01	34442
2010-10-01	39303
2011-01-01	39437
2011-04-01	38886
2011-07-01	36825
2011-10-01	36098
2012-01-01	34165
2012-04-01	34397
2012-07-01	36076
2012-10-01	38247
2013-01-01	39122
2013-04-01	40676
2013-07-01	38252
2013-10-01	37937
2014-01-01	37447
2014-04-01	37543
2014-07-01	36495
2014-10-01	41693
2015-01-01	38104
2015-04-01	37321
2015-07-01	42008
2015-10-01	39772
2016-01-01	43950
2016-04-01	39713
2016-07-01	37562
2016-10-01	36059
2017-01-01	35349
2017-04-01	39589
2017-07-01	40968
2017-10-01	40817
2018-01-01	40281
2018-04-01	41777