Quarter	Millions of US Dollars
1999-10-01	1929
2000-01-01	1853
2000-04-01	1776
2000-07-01	1697
2000-10-01	1828
2001-01-01	1769
2001-04-01	1672
2001-07-01	1853
2001-10-01	1713
2002-01-01	1737
2002-04-01	1999
2002-07-01	2025
2002-10-01	1860
2003-01-01	2045
2003-04-01	2241
2003-07-01	2232
2003-10-01	1679
2004-01-01	1627
2004-04-01	2335
2004-07-01	2443
2004-10-01	2570
2005-01-01	2403
2005-04-01	2435
2005-07-01	2461
2005-10-01	2309
2006-01-01	2545
2006-04-01	2603
2006-07-01	2683
2006-10-01	2364
2007-01-01	2373
2007-04-01	2243
2007-07-01	2407
2007-10-01	2242
2008-01-01	2348
2008-04-01	2568
2008-07-01	2227
2008-10-01	1998
2009-01-01	1927
2009-04-01	1445
2009-07-01	1703
2009-10-01	1518
2010-01-01	1324
2010-04-01	1173
2010-07-01	1323
2010-10-01	1400
2011-01-01	1405
2011-04-01	1219
2011-07-01	1147
2011-10-01	1091
2012-01-01	1331
2012-04-01	1157
2012-07-01	928
2012-10-01	1117
2013-01-01	995
2013-04-01	1360
2013-07-01	1352
2013-10-01	1439
2014-01-01	1917
2014-04-01	1820
2014-07-01	1906
2014-10-01	1864
2015-01-01	1550
2015-04-01	1635
2015-07-01	1898
2015-10-01	1777
2016-01-01	3222
2016-04-01	2738
2016-07-01	2862
2016-10-01	3075
2017-01-01	3106
2017-04-01	3712
2017-07-01	3800
2017-10-01	3516
2018-01-01	4224