Quarter	Millions of US Dollars
1995-01-01	69057
1995-04-01	69057
1995-07-01	69057
1995-10-01	69057
1996-01-01	79456
1996-04-01	79456
1996-07-01	79460
1996-10-01	79456
1997-01-01	91188
1997-04-01	91185
1997-07-01	91188
1997-10-01	91188
1998-01-01	104525
1998-04-01	104511
1998-07-01	104514
1998-10-01	104505
1999-01-01	137856
1999-04-01	137848
1999-07-01	137856
1999-10-01	137856
2000-01-01	145043
2000-04-01	145043
2000-07-01	145040
2000-10-01	145036
2001-01-01	128250
2001-04-01	128253
2001-07-01	128239
2001-10-01	128256
2002-01-01	159725
2002-04-01	159716
2002-07-01	159708
2002-10-01	159712
2003-01-01	171191
2003-04-01	171177
2003-07-01	171186
2003-10-01	171191
2004-01-01	162667
2004-04-01	162658
2004-07-01	162658
2004-10-01	162658
2005-01-01	115724
2005-04-01	115727
2005-07-01	115644
2005-10-01	115724
2006-01-01	97049
2006-04-01	97067
2006-07-01	97056
2006-10-01	97056
2007-01-01	71194
2007-04-01	71187
2007-07-01	71360
2007-10-01	71189
2008-01-01	63173
2008-04-01	63203
2008-07-01	63072
2008-10-01	63148
2009-01-01	59995
2009-04-01	59997
2009-07-01	59997
2009-10-01	59989
2010-01-01	44531
2010-04-01	44529
2010-07-01	44529
2010-10-01	44531
2011-01-01	36131
2011-04-01	36131
2011-07-01	36129
2011-10-01	36131
2012-01-01	22345
2012-04-01	22345
2012-07-01	22345
2012-10-01	22343
2013-01-01	21145
2013-04-01	18665
2013-07-01	17039
2013-10-01	16024
2014-01-01	14639
2014-04-01	14317
2014-07-01	13408
2014-10-01	11799
2015-01-01	10477
2015-04-01	11039
2015-07-01	21037
2015-10-01	37890
2016-01-01	48636
2016-04-01	59010
2016-07-01	62720
2016-10-01	56911
2017-01-01	54582
2017-04-01	54537
2017-07-01	63707
2017-10-01	69200
2018-01-01	73976