Quarter	Millions of US Dollars
1982-07-01	19
1982-10-01	21
1983-01-01	21
1983-04-01	21
1983-07-01	21
1983-10-01	22
1984-01-01	145
1984-04-01	142
1984-07-01	161
1984-10-01	160
1985-01-01	180
1985-04-01	229
1985-07-01	342
1985-10-01	411
1986-01-01	515
1986-04-01	714
1986-07-01	880
1986-10-01	888
1987-01-01	1056
1987-04-01	1218
1987-07-01	1496
1987-10-01	1740
1988-01-01	1980
1988-04-01	2467
1988-07-01	2410
1988-10-01	3241
1989-01-01	3107
1989-04-01	3011
1989-07-01	3092
1989-10-01	3101
1990-01-01	3078
1990-04-01	3134
1990-07-01	3294
1990-10-01	2668
1991-01-01	1723
1991-04-01	1654
1991-07-01	1775
1991-10-01	1919
1992-01-01	1780
1992-04-01	1814
1992-07-01	1754
1992-10-01	1556
1993-01-01	2236
1993-04-01	1978
1993-07-01	2776
1993-10-01	3617
1994-01-01	4485
1994-04-01	4511
1994-07-01	6156
1994-10-01	6671
1995-01-01	8248
1995-04-01	9660
1995-07-01	9066
1995-10-01	9900
1996-01-01	10044
1996-04-01	10819
1996-07-01	10823
1996-10-01	10507
1997-01-01	10345
1997-04-01	11004
1997-07-01	11273
1997-10-01	11759
1998-01-01	12214
1998-04-01	12422
1998-07-01	13179
1998-10-01	13395
1999-01-01	11054
1999-04-01	10706
1999-07-01	10848
1999-10-01	11229
2000-01-01	10376
2000-04-01	9479
2000-07-01	8884
2000-10-01	9290
2001-01-01	9244
2001-04-01	9231
2001-07-01	10474
2001-10-01	10965
2002-01-01	10649
2002-04-01	11161
2002-07-01	11748
2002-10-01	11914
2003-01-01	14728
2003-04-01	16506
2003-07-01	16685
2003-10-01	17994
2004-01-01	16778
2004-04-01	16680
2004-07-01	15992
2004-10-01	17528
2005-01-01	16633
2005-04-01	14539
2005-07-01	14474
2005-10-01	17663
2006-01-01	21742
2006-04-01	22826
2006-07-01	23380
2006-10-01	24316
2007-01-01	24585
2007-04-01	28065
2007-07-01	26621
2007-10-01	27263
2008-01-01	33465
2008-04-01	32349
2008-07-01	29221
2008-10-01	30484
2009-01-01	32473
2009-04-01	38821
2009-07-01	42167
2009-10-01	44399
2010-01-01	41715
2010-04-01	38057
2010-07-01	44101
2010-10-01	41239
2011-01-01	46724
2011-04-01	39853
2011-07-01	37595
2011-10-01	36321
2012-01-01	36671
2012-04-01	34565
2012-07-01	32250
2012-10-01	35511
2013-01-01	33345
2013-04-01	33933
2013-07-01	34983
2013-10-01	35675
2014-01-01	33831
2014-04-01	30117
2014-07-01	32363
2014-10-01	26132
2015-01-01	22520
2015-04-01	23244
2015-07-01	23250
2015-10-01	22667
2016-01-01	23484
2016-04-01	22803
2016-07-01	22903
2016-10-01	18730
2017-01-01	15813
2017-04-01	15994
2017-07-01	16312
2017-10-01	12897
2018-01-01	18129
2018-04-01	17160