Quarter	Millions of US Dollars
1989-01-01	1218
1989-04-01	1166
1989-07-01	1010
1989-10-01	999
1990-01-01	960
1990-04-01	1127
1990-07-01	1184
1990-10-01	1190
1991-01-01	1514
1991-04-01	1667
1991-07-01	1893
1991-10-01	2141
1992-01-01	2367
1992-04-01	2578
1992-07-01	3105
1992-10-01	3003
1993-01-01	2879
1993-04-01	2825
1993-07-01	2963
1993-10-01	3102
1994-01-01	3218
1994-04-01	3253
1994-07-01	3060
1994-10-01	3428
1995-01-01	3618
1995-04-01	4143
1995-07-01	4069
1995-10-01	4064
1996-01-01	4332
1996-04-01	4244
1996-07-01	4474
1996-10-01	4280
1997-01-01	4555
1997-04-01	4559
1997-07-01	4371
1997-10-01	4104
1998-01-01	4759
1998-04-01	4757
1998-07-01	4822
1998-10-01	5173
1999-01-01	5132
1999-04-01	5788
1999-07-01	5858
1999-10-01	7307
2000-01-01	6846
2000-04-01	7419
2000-07-01	7318
2000-10-01	7721
2001-01-01	7613
2001-04-01	7876
2001-07-01	8325
2001-10-01	7918
2002-01-01	8122
2002-04-01	8820
2002-07-01	8965
2002-10-01	9652
2003-01-01	9613
2003-04-01	9783
2003-07-01	9785
2003-10-01	10128
2004-01-01	10755
2004-04-01	11166
2004-07-01	11380
2004-10-01	12359
2005-01-01	12796
2005-04-01	13233
2005-07-01	13194
2005-10-01	12802
2006-01-01	13166
2006-04-01	14962
2006-07-01	16206
2006-10-01	16820
2007-01-01	18721
2007-04-01	19476
2007-07-01	20125
2007-10-01	22885
2008-01-01	25582
2008-04-01	28668
2008-07-01	23513
2008-10-01	24931
2009-01-01	27164
2009-04-01	31807
2009-07-01	34952
2009-10-01	37167
2010-01-01	36944
2010-04-01	37972
2010-07-01	41457
2010-10-01	44526
2011-01-01	45949
2011-04-01	47115
2011-07-01	44450
2011-10-01	45465
2012-01-01	47134
2012-04-01	46974
2012-07-01	47809
2012-10-01	49136
2013-01-01	48321
2013-04-01	40794
2013-07-01	35353
2013-10-01	30728
2014-01-01	17467
2014-04-01	6410
2014-07-01	6267
2014-10-01	6049
2015-01-01	5826
2015-04-01	6089
2015-07-01	5770
2015-10-01	6002
2016-01-01	6323
2016-04-01	6532
2016-07-01	6447
2016-10-01	6228
2017-01-01	8015
2017-04-01	6683
2017-07-01	8469
2017-10-01	7110
2018-01-01	7474