Quarter	Millions of US Dollars
1976-04-01	24
1976-07-01	24
1976-10-01	24
1977-01-01	24
1977-04-01	24
1977-07-01	24
1977-10-01	25
1978-01-01	25
1978-04-01	25
1978-07-01	26
1978-10-01	26
1979-01-01	25
1979-04-01	25
1979-07-01	25
1979-10-01	26
1980-01-01	25
1980-04-01	26
1980-07-01	26
1980-10-01	26
1981-01-01	26
1981-04-01	25
1981-07-01	25
1981-10-01	25
1982-01-01	24
1982-04-01	24
1982-07-01	24
1982-10-01	24
1983-01-01	24
1983-04-01	24
1983-07-01	24
1983-10-01	24
1984-01-01	24
1984-04-01	24
1984-07-01	23
1984-10-01	23
1985-01-01	23
1985-04-01	51
1985-07-01	56
1985-10-01	96
1986-01-01	105
1986-04-01	150
1986-07-01	159
1986-10-01	216
1987-01-01	594
1987-04-01	563
1987-07-01	534
1987-10-01	742
1988-01-01	1180
1988-04-01	1405
1988-07-01	1425
1988-10-01	1967
1989-01-01	1910
1989-04-01	2086
1989-07-01	2498
1989-10-01	2870
1990-01-01	3006
1990-04-01	3252
1990-07-01	3552
1990-10-01	3803
1991-01-01	3563
1991-04-01	3680
1991-07-01	3849
1991-10-01	4432
1992-01-01	4501
1992-04-01	4881
1992-07-01	6192
1992-10-01	6689
1993-01-01	8077
1993-04-01	8726
1993-07-01	9443
1993-10-01	10539
1994-01-01	11580
1994-04-01	11954
1994-07-01	12100
1994-10-01	12023
1995-01-01	12967
1995-04-01	12828
1995-07-01	12710
1995-10-01	12529
1996-01-01	12608
1996-04-01	13661
1996-07-01	12976
1996-10-01	11917
1997-01-01	11746
1997-04-01	12802
1997-07-01	13077
1997-10-01	12915
1998-01-01	13426
1998-04-01	13916
1998-07-01	13661
1998-10-01	12882
1999-01-01	13274
1999-04-01	13242
1999-07-01	13929
1999-10-01	16372
2000-01-01	18053
2000-04-01	19930
2000-07-01	20321
2000-10-01	20458
2001-01-01	20154
2001-04-01	19239
2001-07-01	19981
2001-10-01	19888
2002-01-01	20636
2002-04-01	21633
2002-07-01	21407
2002-10-01	22352
2003-01-01	23034
2003-04-01	24488
2003-07-01	25444
2003-10-01	25533
2004-01-01	25184
2004-04-01	25856
2004-07-01	26262
2004-10-01	28191
2005-01-01	29085
2005-04-01	29221
2005-07-01	29083
2005-10-01	30059
2006-01-01	32723
2006-04-01	32598
2006-07-01	35138
2006-10-01	36443
2007-01-01	39979
2007-04-01	40043
2007-07-01	40080
2007-10-01	41802
2008-01-01	41412
2008-04-01	41872
2008-07-01	42173
2008-10-01	41256
2009-01-01	41756
2009-04-01	42684
2009-07-01	43473
2009-10-01	43293
2010-01-01	44240
2010-04-01	43462
2010-07-01	47541
2010-10-01	48927
2011-01-01	52763
2011-04-01	54204
2011-07-01	53262
2011-10-01	54666
2012-01-01	58890
2012-04-01	61293
2012-07-01	63854
2012-10-01	70936
2013-01-01	72949
2013-04-01	80373
2013-07-01	81743
2013-10-01	90195
2014-01-01	91287
2014-04-01	102017
2014-07-01	107114
2014-10-01	111306
2015-01-01	111958
2015-04-01	113717
2015-07-01	112151
2015-10-01	110824
2016-01-01	113888
2016-04-01	119970
2016-07-01	117928
2016-10-01	120589
2017-01-01	126352
2017-04-01	137363
2017-07-01	138833
2017-10-01	142571
2018-01-01	146547
2018-04-01	143764