Quarter	Millions of US Dollars
1989-10-01	12471
1990-01-01	11963
1990-04-01	11663
1990-07-01	12611
1990-10-01	14156
1991-01-01	14749
1991-04-01	15285
1991-07-01	17400
1991-10-01	20683
1992-01-01	22360
1992-04-01	28045
1992-07-01	31074
1992-10-01	32418
1993-01-01	38455
1993-04-01	42777
1993-07-01	44433
1993-10-01	44919
1994-01-01	48257
1994-04-01	53709
1994-07-01	61580
1994-10-01	64752
1995-01-01	78075
1995-04-01	78785
1995-07-01	78799
1995-10-01	80391
1996-01-01	80615
1996-04-01	82378
1996-07-01	83255
1996-10-01	82687
1997-01-01	81482
1997-04-01	78630
1997-07-01	78554
1997-10-01	74738
1998-01-01	71274
1998-04-01	74659
1998-07-01	80997
1998-10-01	80282
1999-01-01	74191
1999-04-01	71516
1999-07-01	71597
1999-10-01	67602
2000-01-01	66252
2000-04-01	63177
2000-07-01	57945
2000-10-01	58689
2001-01-01	55796
2001-04-01	52644
2001-07-01	56020
2001-10-01	54060
2002-01-01	51092
2002-04-01	59004
2002-07-01	59180
2002-10-01	62588
2003-01-01	63966
2003-04-01	69334
2003-07-01	69815
2003-10-01	72563
2004-01-01	67196
2004-04-01	70190
2004-07-01	73404
2004-10-01	81020
2005-01-01	71060
2005-04-01	67417
2005-07-01	67075
2005-10-01	67960
2006-01-01	64248
2006-04-01	72848
2006-07-01	67126
2006-10-01	75477
2007-01-01	71326
2007-04-01	74882
2007-07-01	73296
2007-10-01	80989
2008-01-01	83354
2008-04-01	84997
2008-07-01	69362
2008-10-01	74136
2009-01-01	80278
2009-04-01	73836
2009-07-01	86206
2009-10-01	91419
2010-01-01	89259
2010-04-01	86595
2010-07-01	97023
2010-10-01	100172
2011-01-01	104143
2011-04-01	105731
2011-07-01	105617
2011-10-01	104569
2012-01-01	106996
2012-04-01	107351
2012-07-01	108913
2012-10-01	113841
2013-01-01	112246
2013-04-01	121397
2013-07-01	119658
2013-10-01	126902
2014-01-01	129575
2014-04-01	133656
2014-07-01	122561
2014-10-01	120509
2015-01-01	107489
2015-04-01	117623
2015-07-01	114097
2015-10-01	114324
2016-01-01	121178
2016-04-01	114002
2016-07-01	114868
2016-10-01	112849
2017-01-01	115961
2017-04-01	121945
2017-07-01	125456
2017-10-01	130753
2018-01-01	132644