Quarter	Millions of US Dollars
1971-01-01	12
1971-04-01	12
1971-07-01	12
1971-10-01	12
1972-01-01	12
1972-04-01	12
1972-07-01	28
1972-10-01	28
1973-01-01	30
1973-04-01	33
1973-07-01	33
1973-10-01	30
1974-01-01	32
1974-04-01	31
1974-07-01	31
1974-10-01	33
1975-01-01	33
1975-04-01	33
1975-07-01	31
1975-10-01	31
1976-01-01	32
1976-04-01	31
1976-07-01	33
1976-10-01	33
1977-01-01	131
1977-04-01	135
1977-07-01	141
1977-10-01	160
1978-01-01	171
1978-04-01	171
1978-07-01	361
1978-10-01	348
1979-01-01	334
1979-04-01	394
1979-07-01	420
1979-10-01	411
1980-01-01	361
1980-04-01	431
1980-07-01	440
1980-10-01	411
1981-01-01	381
1981-04-01	389
1981-07-01	400
1981-10-01	444
1982-01-01	514
1982-04-01	484
1982-07-01	453
1982-10-01	481
1983-01-01	464
1983-04-01	458
1983-07-01	382
1983-10-01	452
1984-01-01	342
1984-04-01	360
1984-07-01	349
1984-10-01	372
1985-01-01	374
1985-04-01	416
1985-07-01	465
1985-10-01	513
1986-01-01	539
1986-04-01	569
1986-07-01	582
1986-10-01	600
1987-01-01	745
1987-04-01	705
1987-07-01	702
1987-10-01	812
1988-01-01	714
1988-04-01	648
1988-07-01	657
1988-10-01	657
1989-01-01	691
1989-04-01	698
1989-07-01	863
1989-10-01	937
1990-01-01	942
1990-04-01	958
1990-07-01	1016
1990-10-01	1062
1991-01-01	940
1991-04-01	906
1991-07-01	994
1991-10-01	1111
1992-01-01	1472
1992-04-01	1596
1992-07-01	1642
1992-10-01	1541
1993-01-01	1474
1993-04-01	1500
1993-07-01	1893
1993-10-01	1777
1994-01-01	1766
1994-04-01	1844
1994-07-01	1892
1994-10-01	1884
1995-01-01	1963
1995-04-01	1988
1995-07-01	2132
1995-10-01	2124
1996-01-01	2096
1996-04-01	3129
1996-07-01	3236
1996-10-01	3206
1997-01-01	2690
1997-04-01	2650
1997-07-01	2240
1997-10-01	2319
1998-01-01	2241
1998-04-01	2332
1998-07-01	2456
1998-10-01	2278
1999-01-01	2473
1999-04-01	2350
1999-07-01	2502
1999-10-01	2410
2000-01-01	2421
2000-04-01	2360
2000-07-01	2359
2000-10-01	2337
2001-01-01	4594
2001-04-01	9861
2001-07-01	10276
2001-10-01	10005
2002-01-01	9913
2002-04-01	11680
2002-07-01	11680
2002-10-01	11996
2003-01-01	12498
2003-04-01	12981
2003-07-01	13734
2003-10-01	15708
2004-01-01	15346
2004-04-01	14040
2004-07-01	14374
2004-10-01	16990
2005-01-01	16525
2005-04-01	15080
2005-07-01	16323
2005-10-01	16978
2006-01-01	15064
2006-04-01	11406
2006-07-01	11779
2006-10-01	13012
2007-01-01	14098
2007-04-01	14631
2007-07-01	14904
2007-10-01	15431
2008-01-01	16130
2008-04-01	20640
2008-07-01	19986
2008-10-01	18784
2009-01-01	19690
2009-04-01	28528
2009-07-01	31824
2009-10-01	31007
2010-01-01	32259
2010-04-01	31131
2010-07-01	36035
2010-10-01	38038
2011-01-01	44515
2011-04-01	44768
2011-07-01	42678
2011-10-01	41963
2012-01-01	49233
2012-04-01	48864
2012-07-01	53144
2012-10-01	60802
2013-01-01	65992
2013-04-01	70793
2013-07-01	73243
2013-10-01	77830
2014-01-01	76344
2014-04-01	77067
2014-07-01	77661
2014-10-01	74951
2015-01-01	76493
2015-04-01	81477
2015-07-01	80550
2015-10-01	80400
2016-01-01	80137
2016-04-01	77315
2016-07-01	77429
2016-10-01	77218
2017-01-01	81626
2017-04-01	82651
2017-07-01	86235
2017-10-01	84702
2018-01-01	89621
2018-04-01	85405