Quarter	Millions of US Dollars
1998-10-01	9
1999-01-01	19
1999-04-01	14
1999-07-01	48
1999-10-01	49
2000-01-01	71
2000-04-01	73
2000-07-01	71
2000-10-01	38
2001-01-01	27
2001-04-01	40
2001-07-01	42
2001-10-01	41
2002-01-01	49
2002-04-01	186
2002-07-01	197
2002-10-01	204
2003-01-01	447
2003-04-01	480
2003-07-01	498
2003-10-01	544
2004-01-01	551
2004-04-01	673
2004-07-01	653
2004-10-01	716
2005-01-01	626
2005-04-01	544
2005-07-01	530
2005-10-01	519
2006-01-01	533
2006-04-01	559
2006-07-01	291
2006-10-01	500
2007-01-01	506
2007-04-01	513
2007-07-01	978
2007-10-01	707
2008-01-01	759
2008-04-01	757
2008-07-01	644
2008-10-01	626
2009-01-01	599
2009-04-01	636
2009-07-01	659
2009-10-01	1008
2010-01-01	944
2010-04-01	859
2010-07-01	955
2010-10-01	935
2011-01-01	1208
2011-04-01	1229
2011-07-01	1148
2011-10-01	1100
2012-01-01	1135
2012-04-01	1448
2012-07-01	1487
2012-10-01	2746
2013-01-01	2689
2013-04-01	2729
2013-07-01	2792
2013-10-01	2834
2014-01-01	2834
2014-04-01	2268
2014-07-01	2153
2014-10-01	2148
2015-01-01	1995
2015-04-01	2075
2015-07-01	2097
2015-10-01	2604
2016-01-01	2661
2016-04-01	2643
2016-07-01	2674
2016-10-01	2412
2017-01-01	2427
2017-04-01	2529
2017-07-01	2088
2017-10-01	1600
2018-01-01	1620
2018-04-01	1579