Quarter	Millions of US Dollars
1989-01-01	3160
1989-04-01	3524
1989-07-01	3719
1989-10-01	3958
1990-01-01	4158
1990-04-01	4446
1990-07-01	4701
1990-10-01	4989
1991-01-01	5793
1991-04-01	5966
1991-07-01	6469
1991-10-01	6897
1992-01-01	7144
1992-04-01	7591
1992-07-01	8454
1992-10-01	8328
1993-01-01	8407
1993-04-01	8738
1993-07-01	9236
1993-10-01	9605
1994-01-01	9882
1994-04-01	10211
1994-07-01	10752
1994-10-01	11046
1995-01-01	12227
1995-04-01	13023
1995-07-01	12649
1995-10-01	13117
1996-01-01	13927
1996-04-01	14169
1996-07-01	14496
1996-10-01	14648
1997-01-01	14600
1997-04-01	14830
1997-07-01	13989
1997-10-01	12983
1998-01-01	14363
1998-04-01	14388
1998-07-01	15685
1998-10-01	17341
1999-01-01	17610
1999-04-01	19065
1999-07-01	19175
1999-10-01	21213
2000-01-01	21222
2000-04-01	22587
2000-07-01	23421
2000-10-01	24951
2001-01-01	25887
2001-04-01	26305
2001-07-01	28589
2001-10-01	28986
2002-01-01	29681
2002-04-01	30204
2002-07-01	31730
2002-10-01	33451
2003-01-01	33772
2003-04-01	33545
2003-07-01	35867
2003-10-01	37125
2004-01-01	38687
2004-04-01	37220
2004-07-01	41489
2004-10-01	44175
2005-01-01	43845
2005-04-01	44980
2005-07-01	48219
2005-10-01	46881
2006-01-01	48708
2006-04-01	52588
2006-07-01	54042
2006-10-01	55936
2007-01-01	56889
2007-04-01	60911
2007-07-01	65154
2007-10-01	68239
2008-01-01	74933
2008-04-01	79388
2008-07-01	71099
2008-10-01	72639
2009-01-01	71165
2009-04-01	80003
2009-07-01	86920
2009-10-01	88244
2010-01-01	90467
2010-04-01	91605
2010-07-01	97444
2010-10-01	103166
2011-01-01	105785
2011-04-01	112702
2011-07-01	104023
2011-10-01	106547
2012-01-01	114490
2012-04-01	112468
2012-07-01	117402
2012-10-01	116780
2013-01-01	118144
2013-04-01	108941
2013-07-01	101839
2013-10-01	98836
2014-01-01	86463
2014-04-01	80282
2014-07-01	79273
2014-10-01	74172
2015-01-01	72823
2015-04-01	78191
2015-07-01	72409
2015-10-01	74642
2016-01-01	81684
2016-04-01	81057
2016-07-01	78388
2016-10-01	76114
2017-01-01	83584
2017-04-01	81505
2017-07-01	86236
2017-10-01	86820
2018-01-01	92199