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	14201
2003-01-01	15773
2003-04-01	16927
2003-07-01	18726
2003-10-01	19618
2004-01-01	20524
2004-04-01	21702
2004-07-01	22481
2004-10-01	23795
2005-01-01	21847
2005-04-01	22719
2005-07-01	22178
2005-10-01	21757
2006-01-01	20018
2006-04-01	27281
2006-07-01	26581
2006-10-01	26814
2007-01-01	26723
2007-04-01	25745
2007-07-01	22353
2007-10-01	24659
2008-01-01	25758
2008-04-01	25863
2008-07-01	22506
2008-10-01	20657
2009-01-01	20166
2009-04-01	23612
2009-07-01	24664
2009-10-01	27081
2010-01-01	26552
2010-04-01	21982
2010-07-01	23512
2010-10-01	24828
2011-01-01	24484
2011-04-01	30196
2011-07-01	27006
2011-10-01	26633
2012-01-01	30533
2012-04-01	27723
2012-07-01	31471
2012-10-01	34030
2013-01-01	31566
2013-04-01	32654
2013-07-01	33973
2013-10-01	33991
2014-01-01	35271
2014-04-01	36834
2014-07-01	35776
2014-10-01	33947
2015-01-01	31883
2015-04-01	32790
2015-07-01	33591
2015-10-01	32425
2016-01-01	33872
2016-04-01	32726
2016-07-01	32134
2016-10-01	28851
2017-01-01	29031
2017-04-01	31047
2017-07-01	33268
2017-10-01	32360
2018-01-01	33120