Quarter	Millions of US Dollars
1987-04-01	3979
1987-07-01	4417
1987-10-01	6633
1988-01-01	6600
1988-04-01	6459
1988-07-01	6317
1988-10-01	6448
1989-01-01	5814
1989-04-01	6847
1989-07-01	7226
1989-10-01	9065
1990-01-01	7376
1990-04-01	9372
1990-07-01	13822
1990-10-01	14698
1991-01-01	14133
1991-04-01	13551
1991-07-01	15641
1991-10-01	15913
1992-01-01	17133
1992-04-01	15518
1992-07-01	16699
1992-10-01	18214
1993-01-01	19075
1993-04-01	22842
1993-07-01	28101
1993-10-01	26721
1994-01-01	29599
1994-04-01	31568
1994-07-01	25576
1994-10-01	30403
1995-01-01	33429
1995-04-01	37104
1995-07-01	28191
1995-10-01	37155
1996-01-01	39418
1996-04-01	49538
1996-07-01	54039
1996-10-01	58650
1997-01-01	62109
1997-04-01	60028
1997-07-01	54671
1997-10-01	53403
1998-01-01	60617
1998-04-01	61737
1998-07-01	68425
1998-10-01	71912
1999-01-01	69372
1999-04-01	69192
1999-07-01	67652
1999-10-01	66778
2000-01-01	73321
2000-04-01	70337
2000-07-01	67892
2000-10-01	59628
2001-01-01	62203
2001-04-01	57178
2001-07-01	57169
2001-10-01	54747
2002-01-01	57643
2002-04-01	57436
2002-07-01	54032
2002-10-01	54242
2003-01-01	55152
2003-04-01	56375
2003-07-01	59541
2003-10-01	58616
2004-01-01	62958
2004-04-01	60751
2004-07-01	59696
2004-10-01	62829
2005-01-01	63053
2005-04-01	61635
2005-07-01	59171
2005-10-01	59273
2006-01-01	60162
2006-04-01	57400
2006-07-01	54830
2006-10-01	57609
2007-01-01	55494
2007-04-01	53250
2007-07-01	54819
2007-10-01	54813
2008-01-01	58510
2008-04-01	57820
2008-07-01	54881
2008-10-01	55856
2009-01-01	54116
2009-04-01	53444
2009-07-01	54197
2009-10-01	56077
2010-01-01	60369
2010-04-01	57978
2010-07-01	60576
2010-10-01	64991
2011-01-01	67272
2011-04-01	68011
2011-07-01	67256
2011-10-01	69055
2012-01-01	77015
2012-04-01	81265
2012-07-01	88381
2012-10-01	91138
2013-01-01	95960
2013-04-01	96937
2013-07-01	102111
2013-10-01	102913
2014-01-01	105441
2014-04-01	109085
2014-07-01	109455
2014-10-01	104988
2015-01-01	110346
2015-04-01	111132
2015-07-01	104033
2015-10-01	102036
2016-01-01	106132
2016-04-01	106759
2016-07-01	110345
2016-10-01	104312
2017-01-01	117684
2017-04-01	118646
2017-07-01	120257
2017-10-01	123142
2018-01-01	128299