Quarter	Millions of US Dollars
1977-01-01	106
1977-04-01	243
1977-07-01	246
1977-10-01	327
1978-01-01	342
1978-04-01	442
1978-07-01	480
1978-10-01	488
1979-01-01	530
1979-04-01	532
1979-07-01	553
1979-10-01	546
1980-01-01	501
1980-04-01	548
1980-07-01	541
1980-10-01	518
1981-01-01	492
1981-04-01	454
1981-07-01	460
1981-10-01	481
1982-01-01	604
1982-04-01	597
1982-07-01	585
1982-10-01	617
1983-01-01	696
1983-04-01	686
1983-07-01	681
1983-10-01	809
1984-01-01	1119
1984-04-01	1010
1984-07-01	1077
1984-10-01	1664
1985-01-01	2160
1985-04-01	2329
1985-07-01	2458
1985-10-01	2599
1986-01-01	2480
1986-04-01	2563
1986-07-01	2259
1986-10-01	1597
1987-01-01	1442
1987-04-01	1233
1987-07-01	1233
1987-10-01	1456
1988-01-01	1343
1988-04-01	1119
1988-07-01	1091
1988-10-01	1155
1989-01-01	1075
1989-04-01	958
1989-07-01	888
1989-10-01	761
1990-01-01	734
1990-04-01	762
1990-07-01	1129
1990-10-01	1738
1991-01-01	1536
1991-04-01	1491
1991-07-01	1575
1991-10-01	2780
1992-01-01	3549
1992-04-01	5256
1992-07-01	7473
1992-10-01	7107
1993-01-01	9875
1993-04-01	10965
1993-07-01	13392
1993-10-01	13302
1994-01-01	13746
1994-04-01	14538
1994-07-01	16583
1994-10-01	16313
1995-01-01	22492
1995-04-01	22715
1995-07-01	21755
1995-10-01	21417
1996-01-01	20817
1996-04-01	20326
1996-07-01	22873
1996-10-01	23164
1997-01-01	22919
1997-04-01	23589
1997-07-01	24554
1997-10-01	23936
1998-01-01	24188
1998-04-01	24278
1998-07-01	27325
1998-10-01	28968
1999-01-01	26344
1999-04-01	27120
1999-07-01	27196
1999-10-01	26833
2000-01-01	24490
2000-04-01	24443
2000-07-01	24610
2000-10-01	25207
2001-01-01	24230
2001-04-01	24050
2001-07-01	25198
2001-10-01	23972
2002-01-01	27188
2002-04-01	28968
2002-07-01	28599
2002-10-01	30303
2003-01-01	29560
2003-04-01	36303
2003-07-01	37223
2003-10-01	38889
2004-01-01	38353
2004-04-01	43106
2004-07-01	42269
2004-10-01	45414
2005-01-01	41891
2005-04-01	39697
2005-07-01	39330
2005-10-01	39980
2006-01-01	41533
2006-04-01	42797
2006-07-01	39861
2006-10-01	49632
2007-01-01	49140
2007-04-01	50317
2007-07-01	52182
2007-10-01	52958
2008-01-01	64744
2008-04-01	66551
2008-07-01	65961
2008-10-01	64857
2009-01-01	65073
2009-04-01	71227
2009-07-01	80624
2009-10-01	79439
2010-01-01	79400
2010-04-01	74361
2010-07-01	80871
2010-10-01	78618
2011-01-01	82932
2011-04-01	88633
2011-07-01	81728
2011-10-01	78519
2012-01-01	78777
2012-04-01	73635
2012-07-01	68778
2012-10-01	70177
2013-01-01	71165
2013-04-01	65609
2013-07-01	60618
2013-10-01	62578
2014-01-01	61508
2014-04-01	60760
2014-07-01	56802
2014-10-01	54479
2015-01-01	42170
2015-04-01	41927
2015-07-01	39121
2015-10-01	37681
2016-01-01	40103
2016-04-01	37773
2016-07-01	37903
2016-10-01	34482
2017-01-01	29291
2017-04-01	30155
2017-07-01	25035
2017-10-01	25175
2018-01-01	20260
2018-04-01	17644