Quarter	Millions of US Dollars
1995-07-01	300
1995-10-01	300
1996-01-01	300
1996-04-01	400
1996-07-01	400
1996-10-01	400
1997-01-01	400
1997-04-01	543
1997-07-01	642
1997-10-01	1040
1998-01-01	1035
1998-04-01	2039
1998-07-01	2399
1998-10-01	2499
1999-01-01	3009
1999-04-01	2992
1999-07-01	3006
1999-10-01	3633
2000-01-01	3597
2000-04-01	4097
2000-07-01	4311
2000-10-01	5216
2001-01-01	5137
2001-04-01	6153
2001-07-01	7316
2001-10-01	7535
2002-01-01	8527
2002-04-01	9371
2002-07-01	10112
2002-10-01	13485
2003-01-01	14220
2003-04-01	14626
2003-07-01	14174
2003-10-01	14273
2004-01-01	13357
2004-04-01	14640
2004-07-01	15975
2004-10-01	18199
2005-01-01	17031
2005-04-01	17198
2005-07-01	16956
2005-10-01	17693
2006-01-01	18600
2006-04-01	21578
2006-07-01	21479
2006-10-01	21281
2007-01-01	21042
2007-04-01	21059
2007-07-01	21445
2007-10-01	21316
2008-01-01	21401
2008-04-01	21779
2008-07-01	21423
2008-10-01	21395
2009-01-01	23451
2009-04-01	23193
2009-07-01	22867
2009-10-01	20841
2010-01-01	20930
2010-04-01	20870
2010-07-01	20938
2010-10-01	21944
2011-01-01	22516
2011-04-01	22529
2011-07-01	23631
2011-10-01	26504
2012-01-01	25962
2012-04-01	29127
2012-07-01	28357
2012-10-01	32246
2013-01-01	31336
2013-04-01	33860
2013-07-01	34073
2013-10-01	34099
2014-01-01	34098
2014-04-01	34585
2014-07-01	34490
2014-10-01	34450
2015-01-01	36277
2015-04-01	35816
2015-07-01	35317
2015-10-01	36889
2016-01-01	36615
2016-04-01	38589
2016-07-01	38595
2016-10-01	38670
2017-01-01	40183
2017-04-01	40247
2017-07-01	39982
2017-10-01	36371
2018-01-01	35700
2018-04-01	40241