Quarter	Millions of US Dollars
1971-01-01	40
1971-04-01	80
1971-07-01	82
1971-10-01	84
1972-01-01	181
1972-04-01	281
1972-07-01	306
1972-10-01	328
1973-01-01	437
1973-04-01	481
1973-07-01	475
1973-10-01	444
1974-01-01	620
1974-04-01	647
1974-07-01	903
1974-10-01	1109
1975-01-01	1764
1975-04-01	2294
1975-07-01	2464
1975-10-01	2987
1976-01-01	3916
1976-04-01	4863
1976-07-01	5415
1976-10-01	6014
1977-01-01	6395
1977-04-01	6767
1977-07-01	7098
1977-10-01	8234
1978-01-01	8917
1978-04-01	9387
1978-07-01	10456
1978-10-01	10497
1979-01-01	10623
1979-04-01	11332
1979-07-01	12260
1979-10-01	12668
1980-01-01	11907
1980-04-01	13254
1980-07-01	13330
1980-10-01	13635
1981-01-01	13905
1981-04-01	13436
1981-07-01	13766
1981-10-01	14675
1982-01-01	15984
1982-04-01	17420
1982-07-01	18923
1982-10-01	20979
1983-01-01	22604
1983-04-01	23954
1983-07-01	24354
1983-10-01	25454
1984-01-01	27815
1984-04-01	27874
1984-07-01	29704
1984-10-01	30771
1985-01-01	32962
1985-04-01	33565
1985-07-01	36623
1985-10-01	37494
1986-01-01	38542
1986-04-01	41554
1986-07-01	43807
1986-10-01	45317
1987-01-01	50697
1987-04-01	51799
1987-07-01	51472
1987-10-01	56685
1988-01-01	57422
1988-04-01	58183
1988-07-01	59439
1988-10-01	62866
1989-01-01	62897
1989-04-01	62620
1989-07-01	65987
1989-10-01	68450
1990-01-01	70072
1990-04-01	73781
1990-07-01	81876
1990-10-01	85118
1991-01-01	83879
1991-04-01	88498
1991-07-01	95946
1991-10-01	107480
1992-01-01	108214
1992-04-01	118458
1992-07-01	127068
1992-10-01	120952
1993-01-01	124173
1993-04-01	126469
1993-07-01	135854
1993-10-01	137911
1994-01-01	147124
1994-04-01	152113
1994-07-01	158404
1994-10-01	159529
1995-01-01	171851
1995-04-01	171358
1995-07-01	169061
1995-10-01	173568
1996-01-01	169355
1996-04-01	174284
1996-07-01	178113
1996-10-01	177003
1997-01-01	173372
1997-04-01	172045
1997-07-01	173760
1997-10-01	172729
1998-01-01	180891
1998-04-01	186545
1998-07-01	203162
1998-10-01	211563
1999-01-01	211630
1999-04-01	218738
1999-07-01	233475
1999-10-01	237665
2000-01-01	239327
2000-04-01	252448
2000-07-01	253856
2000-10-01	276955
2001-01-01	294792
2001-04-01	302506
2001-07-01	335549
2001-10-01	347545
2002-01-01	348754
2002-04-01	409485
2002-07-01	415375
2002-10-01	452660
2003-01-01	489672
2003-04-01	544059
2003-07-01	568879
2003-10-01	631099
2004-01-01	626843
2004-04-01	641272
2004-07-01	674899
2004-10-01	769490
2005-01-01	761519
2005-04-01	752364
2005-07-01	754877
2005-10-01	769280
2006-01-01	811093
2006-04-01	874165
2006-07-01	880550
2006-10-01	987955
2007-01-01	1025484
2007-04-01	1095565
2007-07-01	1136279
2007-10-01	1208621
2008-01-01	1306201
2008-04-01	1388878
2008-07-01	1296207
2008-10-01	1261198
2009-01-01	1251143
2009-04-01	1426367
2009-07-01	1498185
2009-10-01	1521036
2010-01-01	1518270
2010-04-01	1423050
2010-07-01	1593822
2010-10-01	1596831
2011-01-01	1752112
2011-04-01	1793205
2011-07-01	1683669
2011-10-01	1638851
2012-01-01	1698139
2012-04-01	1599964
2012-07-01	1640773
2012-10-01	1657708
2013-01-01	1600982
2013-04-01	1623347
2013-07-01	1667139
2013-10-01	1694776
2014-01-01	1718589
2014-04-01	1720996
2014-07-01	1625794
2014-10-01	1549116
2015-01-01	1436394
2015-04-01	1449061
2015-07-01	1423311
2015-10-01	1386841
2016-01-01	1438007
2016-04-01	1434154
2016-07-01	1449905
2016-10-01	1393911
2017-01-01	1406191
2017-04-01	1468345
2017-07-01	1498054
2017-10-01	1527759
2018-01-01	1554835
2018-04-01	1492673