Quarter	Millions of US Dollars
1993-01-01	380
1993-04-01	399
1993-07-01	387
1993-10-01	354
1994-01-01	277
1994-04-01	449
1994-07-01	720
1994-10-01	962
1995-01-01	1202
1995-04-01	1445
1995-07-01	1401
1995-10-01	1633
1996-01-01	2453
1996-04-01	2317
1996-07-01	2498
1996-10-01	2565
1997-01-01	2547
1997-04-01	2592
1997-07-01	2669
1997-10-01	2788
1998-01-01	2765
1998-04-01	3357
1998-07-01	3114
1998-10-01	3200
1999-01-01	2650
1999-04-01	3041
1999-07-01	3402
1999-10-01	3292
2000-01-01	3503
2000-04-01	3432
2000-07-01	3137
2000-10-01	3415
2001-01-01	4445
2001-04-01	4691
2001-07-01	4879
2001-10-01	5095
2002-01-01	5439
2002-04-01	5870
2002-07-01	5704
2002-10-01	6437
2003-01-01	6605
2003-04-01	7362
2003-07-01	7778
2003-10-01	8959
2004-01-01	9447
2004-04-01	9964
2004-07-01	10280
2004-10-01	11942
2005-01-01	11121
2005-04-01	9776
2005-07-01	9571
2005-10-01	10277
2006-01-01	11174
2006-04-01	11334
2006-07-01	11988
2006-10-01	14605
2007-01-01	15724
2007-04-01	17529
2007-07-01	18095
2007-10-01	19080
2008-01-01	20061
2008-04-01	23410
2008-07-01	21845
2008-10-01	23123
2009-01-01	22637
2009-04-01	27002
2009-07-01	29684
2009-10-01	29337
2010-01-01	28211
2010-04-01	28358
2010-07-01	31312
2010-10-01	33519
2011-01-01	36687
2011-04-01	38095
2011-07-01	35562
2011-10-01	34971
2012-01-01	39711
2012-04-01	40412
2012-07-01	42221
2012-10-01	43509
2013-01-01	44947
2013-04-01	48462
2013-07-01	49316
2013-10-01	47446
2014-01-01	50769
2014-04-01	48424
2014-07-01	44970
2014-10-01	42652
2015-01-01	38628
2015-04-01	40625
2015-07-01	40057
2015-10-01	38589
2016-01-01	39767
2016-04-01	40287
2016-07-01	40776
2016-10-01	38147
2017-01-01	40156
2017-04-01	41815
2017-07-01	43531
2017-10-01	44461
2018-01-01	46158