Quarter	Millions of US Dollars
1987-01-01	0
1987-04-01	0
1987-07-01	0
1987-10-01	0
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	0
1989-01-01	0
1989-04-01	0
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	0
1992-04-01	0
1992-07-01	0
1992-10-01	0
1993-01-01	0
1993-04-01	0
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	9
1994-07-01	22
1994-10-01	27
1995-01-01	33
1995-04-01	33
1995-07-01	44
1995-10-01	50
1996-01-01	49
1996-04-01	65
1996-07-01	71
1996-10-01	76
1997-01-01	85
1997-04-01	98
1997-07-01	99
1997-10-01	115
1998-01-01	124
1998-04-01	140
1998-07-01	196
1998-10-01	251
1999-01-01	248
1999-04-01	265
1999-07-01	292
1999-10-01	345
2000-01-01	327
2000-04-01	312
2000-07-01	276
2000-10-01	265
2001-01-01	246
2001-04-01	234
2001-07-01	241
2001-10-01	301
2002-01-01	327
2002-04-01	375
2002-07-01	423
2002-10-01	542
2003-01-01	570
2003-04-01	616
2003-07-01	671
2003-10-01	969
2004-01-01	914
2004-04-01	962
2004-07-01	1123
2004-10-01	1792
2005-01-01	1816
2005-04-01	2316
2005-07-01	2520
2005-10-01	3127
2006-01-01	2830
2006-04-01	3334
2006-07-01	3586
2006-10-01	4140
2007-01-01	4128
2007-04-01	5259
2007-07-01	5894
2007-10-01	6270
2008-01-01	4388
2008-04-01	4342
2008-07-01	3574
2008-10-01	2756
2009-01-01	2834
2009-04-01	2231
2009-07-01	1966
2009-10-01	1640
2010-01-01	1048
2010-04-01	1092
2010-07-01	1229
2010-10-01	1246
2011-01-01	1343
2011-04-01	1310
2011-07-01	1177
2011-10-01	1163
2012-01-01	1071
2012-04-01	1033
2012-07-01	1021
2012-10-01	1028
2013-01-01	1170
2013-04-01	1359
2013-07-01	1151
2013-10-01	1441
2014-01-01	1392
2014-04-01	1390
2014-07-01	1547
2014-10-01	1733
2015-01-01	1611
2015-04-01	1892
2015-07-01	1940
2015-10-01	1993
2016-01-01	2117
2016-04-01	2223
2016-07-01	2424
2016-10-01	2594
2017-01-01	2625
2017-04-01	2985
2017-07-01	2835
2017-10-01	2912
2018-01-01	3235