Quarter	Millions of US Dollars
1969-01-01	95
1969-04-01	110
1969-07-01	110
1969-10-01	110
1970-01-01	110
1970-04-01	110
1970-07-01	110
1970-10-01	110
1971-01-01	110
1971-04-01	110
1971-07-01	110
1971-10-01	170
1972-01-01	372
1972-04-01	373
1972-07-01	475
1972-10-01	475
1973-01-01	601
1973-04-01	692
1973-07-01	775
1973-10-01	728
1974-01-01	774
1974-04-01	860
1974-07-01	1022
1974-10-01	1373
1975-01-01	1578
1975-04-01	1948
1975-07-01	1948
1975-10-01	2044
1976-01-01	2409
1976-04-01	2724
1976-07-01	2926
1976-10-01	3064
1977-01-01	3578
1977-04-01	3840
1977-07-01	4120
1977-10-01	5008
1978-01-01	5490
1978-04-01	5561
1978-07-01	6120
1978-10-01	6239
1979-01-01	6602
1979-04-01	6720
1979-07-01	6831
1979-10-01	6652
1980-01-01	6069
1980-04-01	6962
1980-07-01	7134
1980-10-01	7082
1981-01-01	6988
1981-04-01	6517
1981-07-01	6713
1981-10-01	7180
1982-01-01	6824
1982-04-01	6839
1982-07-01	7093
1982-10-01	7763
1983-01-01	7715
1983-04-01	7613
1983-07-01	7827
1983-10-01	7894
1984-01-01	8279
1984-04-01	8016
1984-07-01	7788
1984-10-01	8134
1985-01-01	8093
1985-04-01	8372
1985-07-01	9149
1985-10-01	9662
1986-01-01	10733
1986-04-01	11416
1986-07-01	12334
1986-10-01	13561
1987-01-01	16837
1987-04-01	17525
1987-07-01	18081
1987-10-01	19479
1988-01-01	20060
1988-04-01	19687
1988-07-01	21043
1988-10-01	21990
1989-01-01	20829
1989-04-01	22070
1989-07-01	23822
1989-10-01	25172
1990-01-01	28823
1990-04-01	29842
1990-07-01	32752
1990-10-01	34118
1991-01-01	34895
1991-04-01	34803
1991-07-01	38189
1991-10-01	42538
1992-01-01	44130
1992-04-01	47844
1992-07-01	52495
1992-10-01	50472
1993-01-01	51640
1993-04-01	55710
1993-07-01	39138
1993-10-01	39880
1994-01-01	43514
1994-04-01	46679
1994-07-01	52999
1994-10-01	54314
1995-01-01	60610
1995-04-01	63708
1995-07-01	64931
1995-10-01	66772
1996-01-01	72082
1996-04-01	78309
1996-07-01	81720
1996-10-01	85761
1997-01-01	87641
1997-04-01	92293
1997-07-01	103193
1997-10-01	105824
1998-01-01	111022
1998-04-01	118693
1998-07-01	135128
1998-10-01	145776
1999-01-01	149089
1999-04-01	160667
1999-07-01	182357
1999-10-01	183041
2000-01-01	182757
2000-04-01	200210
2000-07-01	203582
2000-10-01	245569
2001-01-01	250256
2001-04-01	257712
2001-07-01	276732
2001-10-01	288437
2002-01-01	295412
2002-04-01	338835
2002-07-01	352174
2002-10-01	380160
2003-01-01	407666
2003-04-01	446382
2003-07-01	465713
2003-10-01	523937
2004-01-01	529135
2004-04-01	547817
2004-07-01	560730
2004-10-01	624167
2005-01-01	626827
2005-04-01	617577
2005-07-01	630422
2005-10-01	660955
2006-01-01	702696
2006-04-01	766118
2006-07-01	794735
2006-10-01	859788
2007-01-01	907194
2007-04-01	951659
2007-07-01	988233
2007-10-01	1019182
2008-01-01	1112267
2008-04-01	1154052
2008-07-01	1072958
2008-10-01	1063016
2009-01-01	1076695
2009-04-01	1185723
2009-07-01	1241824
2009-10-01	1229949
2010-01-01	1232115
2010-04-01	1136406
2010-07-01	1299831
2010-10-01	1294973
2011-01-01	1369638
2011-04-01	1416633
2011-07-01	1362829
2011-10-01	1365497
2012-01-01	1419581
2012-04-01	1360552
2012-07-01	1400597
2012-10-01	1420648
2013-01-01	1370416
2013-04-01	1400488
2013-07-01	1452269
2013-10-01	1423762
2014-01-01	1435958
2014-04-01	1441518
2014-07-01	1354055
2014-10-01	1308280
2015-01-01	1207861
2015-04-01	1255903
2015-07-01	1251688
2015-10-01	1202647
2016-01-01	1261236
2016-04-01	1239948
2016-07-01	1238323
2016-10-01	1157501
2017-01-01	1201415
2017-04-01	1246960
2017-07-01	1292188
2017-10-01	1285536
2018-01-01	1323000
2018-04-01	1270220