Quarter	Millions of US Dollars
2004-01-01	1343
2004-04-01	1566
2004-07-01	1574
2004-10-01	1626
2005-01-01	1584
2005-04-01	2065
2005-07-01	2495
2005-10-01	3641
2006-01-01	4748
2006-04-01	5491
2006-07-01	7217
2006-10-01	9440
2007-01-01	11163
2007-04-01	13538
2007-07-01	14245
2007-10-01	17854
2008-01-01	20634
2008-04-01	23712
2008-07-01	23673
2008-10-01	21690
2009-01-01	19120
2009-04-01	21789
2009-07-01	23907
2009-10-01	26119
2010-01-01	27030
2010-04-01	26107
2010-07-01	29758
2010-10-01	33371
2011-01-01	37217
2011-04-01	39893
2011-07-01	36082
2011-10-01	39531
2012-01-01	48714
2012-04-01	45302
2012-07-01	52676
2012-10-01	60188
2013-01-01	62746
2013-04-01	61652
2013-07-01	67149
2013-10-01	72849
2014-01-01	71295
2014-04-01	83358
2014-07-01	73516
2014-10-01	53407
2015-01-01	55223
2015-04-01	59904
2015-07-01	52670
2015-10-01	47463
2016-01-01	52172
2016-04-01	58437
2016-07-01	58004
2016-10-01	60161
2017-01-01	67893
2017-04-01	69713
2017-07-01	71655
2017-10-01	73700
2018-01-01	74507