Quarter	Millions of US Dollars
1990-10-01	134
1991-01-01	117
1991-04-01	110
1991-07-01	120
1991-10-01	132
1992-01-01	122
1992-04-01	131
1992-07-01	142
1992-10-01	124
1993-01-01	124
1993-04-01	118
1993-07-01	186
1993-10-01	180
1994-01-01	183
1994-04-01	188
1994-07-01	129
1994-10-01	129
1995-01-01	145
1995-04-01	144
1995-07-01	140
2001-07-01	250
2001-10-01	350
2002-01-01	381
2002-04-01	581
2002-07-01	576
2002-10-01	569
2003-01-01	759
2003-04-01	775
2003-07-01	775
2003-10-01	728
2004-01-01	728
2004-04-01	894
2004-07-01	894
2004-10-01	1068
2005-01-01	1068
2005-04-01	1116
2005-07-01	1093
2005-10-01	1070
2006-01-01	1070
2006-04-01	945
2006-07-01	945
2006-10-01	975
2007-01-01	975
2007-04-01	975
2007-07-01	975
2007-10-01	975
2008-01-01	975
2008-04-01	975
2008-07-01	1012
2008-10-01	1012
2009-01-01	1012
2009-04-01	1012
2009-07-01	1012
2009-10-01	1267
2010-01-01	1267
2010-04-01	1267
2010-07-01	1267
2010-10-01	1347
2011-01-01	1347
2011-04-01	1347
2011-07-01	760
2011-10-01	760
2012-01-01	760
2012-04-01	760
2012-07-01	760
2012-10-01	1410
2013-01-01	1410
2013-04-01	1610
2013-07-01	1610
2013-10-01	1635
2014-01-01	1635
2014-04-01	1635
2014-07-01	1635
2014-10-01	1455
2015-01-01	1455
2015-04-01	1455
2015-07-01	1455
2015-10-01	1455
2016-01-01	1455
2016-04-01	1455
2016-07-01	1455
2016-10-01	1455
2017-01-01	1375
2017-04-01	1375
2017-07-01	1375
2017-10-01	725
2018-01-01	725
2018-04-01	725