Quarter	Millions of US Dollars
1999-07-01	11
1999-10-01	10
2000-01-01	10
2000-04-01	10
2000-07-01	9
2000-10-01	9
2001-01-01	9
2001-04-01	8
2001-07-01	9
2001-10-01	9
2002-01-01	9
2002-04-01	10
2002-07-01	207
2002-10-01	220
2003-01-01	229
2003-04-01	240
2003-07-01	245
2003-10-01	265
2004-01-01	257
2004-04-01	255
2004-07-01	248
2004-10-01	272
2005-01-01	259
2005-04-01	242
2005-07-01	241
2005-10-01	419
2006-01-01	363
2006-04-01	381
2006-07-01	380
2006-10-01	395
2007-01-01	400
2007-04-01	405
2007-07-01	425
2007-10-01	442
2008-01-01	474
2008-04-01	473
2008-07-01	429
2008-10-01	418
2009-01-01	399
2009-04-01	424
2009-07-01	439
2009-10-01	432
2010-01-01	404
2010-04-01	368
2010-07-01	409
2010-10-01	401
2011-01-01	426
2011-04-01	434
2011-07-01	709
2011-10-01	679
2012-01-01	701
2012-04-01	1039
2012-07-01	1067
2012-10-01	1089
2013-01-01	1056
2013-04-01	1228
2013-07-01	1264
2013-10-01	1286
2014-01-01	1426
2014-04-01	1410
2014-07-01	1303
2014-10-01	1244
2015-01-01	1106
2015-04-01	1150
2015-07-01	1702
2015-10-01	1653
2016-01-01	1731
2016-04-01	1689
2016-07-01	1702
2016-10-01	1607
2017-01-01	1628
2017-04-01	1734
2017-07-01	1795
2017-10-01	1819
2018-01-01	1870
2018-04-01	2034