Quarter	Millions of US Dollars
1994-07-01	254
1994-10-01	251
1995-01-01	287
1995-04-01	295
1995-07-01	253
1995-10-01	305
1996-01-01	296
1996-04-01	287
1996-07-01	282
1996-10-01	551
1997-01-01	535
1997-04-01	555
1997-07-01	540
1997-10-01	522
1998-01-01	717
1998-04-01	1558
1998-07-01	1699
1998-10-01	1964
1999-01-01	1889
1999-04-01	2270
1999-07-01	2295
1999-10-01	2377
2000-01-01	2465
2000-04-01	3087
2000-07-01	2943
2000-10-01	2984
2001-01-01	2865
2001-04-01	2886
2001-07-01	2959
2001-10-01	2801
2002-01-01	2782
2002-04-01	3223
2002-07-01	3208
2002-10-01	3097
2003-01-01	3187
2003-04-01	2989
2003-07-01	2949
2003-10-01	3479
2004-01-01	3378
2004-04-01	4214
2004-07-01	4292
2004-10-01	4408
2005-01-01	4215
2005-04-01	3053
2005-07-01	3040
2005-10-01	2791
2006-01-01	4070
2006-04-01	4261
2006-07-01	4098
2006-10-01	4075
2007-01-01	4129
2007-04-01	5265
2007-07-01	5526
2007-10-01	5740
2008-01-01	6175
2008-04-01	6181
2008-07-01	5607
2008-10-01	5458
2009-01-01	5219
2009-04-01	8370
2009-07-01	8671
2009-10-01	8531
2010-01-01	7982
2010-04-01	8494
2010-07-01	9447
2010-10-01	9249
2011-01-01	11610
2011-04-01	12967
2011-07-01	12115
2011-10-01	11609
2012-01-01	11983
2012-04-01	14819
2012-07-01	15135
2012-10-01	15384
2013-01-01	15013
2013-04-01	17486
2013-07-01	18975
2013-10-01	21863
2014-01-01	22439
2014-04-01	21955
2014-07-01	20490
2014-10-01	19114
2015-01-01	16474
2015-04-01	16998
2015-07-01	16933
2015-10-01	16552
2016-01-01	15753
2016-04-01	15228
2016-07-01	15307
2016-10-01	14629
2017-01-01	14796
2017-04-01	14406
2017-07-01	14751
2017-10-01	14895
2018-01-01	15609
2018-04-01	14592