Quarter	Millions of US Dollars
1976-01-01	17
1976-04-01	47
1976-07-01	47
1976-10-01	82
1977-01-01	122
1977-04-01	122
1977-07-01	128
1977-10-01	130
1978-01-01	131
1978-04-01	162
1978-07-01	164
1978-10-01	163
1979-01-01	163
1979-04-01	189
1979-07-01	248
1979-10-01	247
1980-01-01	239
1980-04-01	247
1980-07-01	246
1980-10-01	242
1981-01-01	237
1981-04-01	203
1981-07-01	205
1981-10-01	175
1982-01-01	170
1982-04-01	166
1982-07-01	157
1982-10-01	161
1983-01-01	159
1983-04-01	158
1983-07-01	158
1983-10-01	157
1984-01-01	157
1984-04-01	136
1984-07-01	134
1984-10-01	133
1985-01-01	133
1985-04-01	134
1985-07-01	137
1985-10-01	113
1986-01-01	100
1986-04-01	101
1986-07-01	103
1986-10-01	85
1987-01-01	88
1987-04-01	60
1987-07-01	57
1987-10-01	63
1988-01-01	61
1988-04-01	55
1988-07-01	54
1988-10-01	55
1989-01-01	25
1989-04-01	25
1994-04-01	20
1994-07-01	20
1994-10-01	5860
1995-01-01	5840
1995-04-01	5840
1995-07-01	6090
1995-10-01	6090
1996-01-01	6090
1996-04-01	6290
1996-07-01	6443
1996-10-01	6481
1997-01-01	6468
1997-04-01	6589
1997-07-01	6984
1997-10-01	6980
1998-01-01	6978
1998-04-01	6980
1998-07-01	6989
1998-10-01	6495
1999-01-01	6465
1999-04-01	6310
1999-07-01	6313
1999-10-01	6252
2000-01-01	6817
2000-04-01	6757
2000-07-01	6556
2000-10-01	5661
2001-01-01	6282
2001-04-01	5905
2001-07-01	5894
2001-10-01	6055
2002-01-01	6669
2002-04-01	6951
2002-07-01	8297
2002-10-01	7774
2003-01-01	9498
2003-04-01	9541
2003-07-01	11398
2003-10-01	13060
2004-01-01	15839
2004-04-01	17076
2004-07-01	17293
2004-10-01	18522
2005-01-01	22400
2005-04-01	28212
2005-07-01	27032
2005-10-01	28659
2006-01-01	33415
2006-04-01	34990
2006-07-01	34183
2006-10-01	35952
2007-01-01	36257
2007-04-01	37748
2007-07-01	39066
2007-10-01	40705
2008-01-01	42833
2008-04-01	46302
2008-07-01	42618
2008-10-01	42344
2009-01-01	42453
2009-04-01	46524
2009-07-01	51290
2009-10-01	52416
2010-01-01	55286
2010-04-01	51585
2010-07-01	58987
2010-10-01	57410
2011-01-01	60633
2011-04-01	64026
2011-07-01	61379
2011-10-01	61670
2012-01-01	66519
2012-04-01	65329
2012-07-01	68776
2012-10-01	74469
2013-01-01	68989
2013-04-01	69782
2013-07-01	71520
2013-10-01	74839
2014-01-01	75849
2014-04-01	73092
2014-07-01	68675
2014-10-01	66530
2015-01-01	62148
2015-04-01	63938
2015-07-01	64569
2015-10-01	62960
2016-01-01	63573
2016-04-01	65934
2016-07-01	64924
2016-10-01	64966
2017-01-01	65261
2017-04-01	67780
2017-07-01	71264
2017-10-01	76882
2018-01-01	80447
2018-04-01	75388