Quarter	Millions of US Dollars
1987-04-01	1531
1987-07-01	1779
1987-10-01	1805
1988-01-01	1783
1988-04-01	1856
1988-07-01	1799
1988-10-01	1852
1989-01-01	1914
1989-04-01	1961
1989-07-01	1852
1989-10-01	1736
1990-01-01	1800
1990-04-01	1763
1990-07-01	1742
1990-10-01	1902
1991-01-01	1966
1991-04-01	2253
1991-07-01	2379
1991-10-01	2531
1992-01-01	2802
1992-04-01	2831
1992-07-01	2709
1992-10-01	2620
1993-01-01	2417
1993-04-01	2386
1993-07-01	2246
1993-10-01	2269
1994-01-01	2399
1994-04-01	2247
1994-07-01	2620
1994-10-01	2690
1995-01-01	2433
1995-04-01	2916
1995-07-01	2948
1995-10-01	3379
1996-01-01	3544
1996-04-01	5686
1996-07-01	7139
1996-10-01	9100
1997-01-01	9715
1997-04-01	10502
1997-07-01	11092
1997-10-01	9855
1998-01-01	10152
1998-04-01	11565
1998-07-01	12975
1998-10-01	16081
1999-01-01	16258
1999-04-01	17482
1999-07-01	18207
1999-10-01	18814
2000-01-01	19998
2000-04-01	21443
2000-07-01	21869
2000-10-01	21368
2001-01-01	21786
2001-04-01	21825
2001-07-01	22780
2001-10-01	23064
2002-01-01	24164
2002-04-01	26599
2002-07-01	26889
2002-10-01	28981
2003-01-01	29151
2003-04-01	31643
2003-07-01	34040
2003-10-01	34622
2004-01-01	35486
2004-04-01	35638
2004-07-01	35828
2004-10-01	38211
2005-01-01	38315
2005-04-01	38300
2005-07-01	36684
2005-10-01	36294
2006-01-01	35901
2006-04-01	34581
2006-07-01	33407
2006-10-01	35339
2007-01-01	34271
2007-04-01	33993
2007-07-01	33738
2007-10-01	34060
2008-01-01	35649
2008-04-01	35013
2008-07-01	32677
2008-10-01	34686
2009-01-01	32600
2009-04-01	32379
2009-07-01	33210
2009-10-01	35556
2010-01-01	36241
2010-04-01	36005
2010-07-01	38013
2010-10-01	41242
2011-01-01	41786
2011-04-01	44388
2011-07-01	43877
2011-10-01	44599
2012-01-01	47373
2012-04-01	50012
2012-07-01	54491
2012-10-01	55753
2013-01-01	57342
2013-04-01	58144
2013-07-01	61948
2013-10-01	62556
2014-01-01	62751
2014-04-01	65364
2014-07-01	65732
2014-10-01	63578
2015-01-01	64820
2015-04-01	66042
2015-07-01	63229
2015-10-01	60966
2016-01-01	59667
2016-04-01	60126
2016-07-01	60806
2016-10-01	58537
2017-01-01	60846
2017-04-01	63303
2017-07-01	63625
2017-10-01	65370
2018-01-01	66596