Quarter	Millions of US Dollars
1968-07-01	40
1968-10-01	40
1969-01-01	135
1969-04-01	150
1969-07-01	170
1969-10-01	170
1970-01-01	170
1970-04-01	170
1970-07-01	170
1970-10-01	170
1971-01-01	170
1971-04-01	170
1971-07-01	170
1971-10-01	185
1972-01-01	205
1972-04-01	301
1972-07-01	532
1972-10-01	601
1973-01-01	820
1973-04-01	982
1973-07-01	1041
1973-10-01	1068
1974-01-01	1119
1974-04-01	1224
1974-07-01	1392
1974-10-01	1788
1975-01-01	2047
1975-04-01	2288
1975-07-01	2263
1975-10-01	2385
1976-01-01	2475
1976-04-01	2848
1976-07-01	3121
1976-10-01	3297
1977-01-01	3517
1977-04-01	3766
1977-07-01	4136
1977-10-01	4526
1978-01-01	4811
1978-04-01	4962
1978-07-01	5637
1978-10-01	5856
1979-01-01	6518
1979-04-01	6791
1979-07-01	6839
1979-10-01	6751
1980-01-01	6423
1980-04-01	7671
1980-07-01	8315
1980-10-01	8902
1981-01-01	8901
1981-04-01	8787
1981-07-01	9220
1981-10-01	10430
1982-01-01	10170
1982-04-01	10355
1982-07-01	10467
1982-10-01	12381
1983-01-01	13682
1983-04-01	14643
1983-07-01	15078
1983-10-01	17003
1984-01-01	19703
1984-04-01	20781
1984-07-01	21871
1984-10-01	22929
1985-01-01	23989
1985-04-01	25139
1985-07-01	26685
1985-10-01	26951
1986-01-01	28666
1986-04-01	31166
1986-07-01	33954
1986-10-01	36060
1987-01-01	43381
1987-04-01	46102
1987-07-01	47633
1987-10-01	51391
1988-01-01	52956
1988-04-01	53441
1988-07-01	55771
1988-10-01	61496
1989-01-01	60533
1989-04-01	63163
1989-07-01	66137
1989-10-01	70802
1990-01-01	77025
1990-04-01	79221
1990-07-01	86044
1990-10-01	89645
1991-01-01	87738
1991-04-01	86693
1991-07-01	93690
1991-10-01	102067
1992-01-01	101540
1992-04-01	108526
1992-07-01	116897
1992-10-01	109759
1993-01-01	114093
1993-04-01	119100
1993-07-01	118621
1993-10-01	119739
1994-01-01	128727
1994-04-01	136346
1994-07-01	144953
1994-10-01	149465
1995-01-01	167509
1995-04-01	177179
1995-07-01	177657
1995-10-01	181747
1996-01-01	190273
1996-04-01	196593
1996-07-01	203078
1996-10-01	207294
1997-01-01	209116
1997-04-01	215836
1997-07-01	225923
1997-10-01	228883
1998-01-01	237218
1998-04-01	256452
1998-07-01	284655
1998-10-01	297258
1999-01-01	305089
1999-04-01	338983
1999-07-01	380041
1999-10-01	382522
2000-01-01	384798
2000-04-01	406073
2000-07-01	417161
2000-10-01	465233
2001-01-01	468972
2001-04-01	479057
2001-07-01	520561
2001-10-01	534448
2002-01-01	546694
2002-04-01	624923
2002-07-01	643759
2002-10-01	692197
2003-01-01	732903
2003-04-01	792590
2003-07-01	820562
2003-10-01	920129
2004-01-01	905338
2004-04-01	917767
2004-07-01	931900
2004-10-01	1031065
2005-01-01	1012338
2005-04-01	976019
2005-07-01	972063
2005-10-01	998464
2006-01-01	1047771
2006-04-01	1147274
2006-07-01	1178917
2006-10-01	1280866
2007-01-01	1361857
2007-04-01	1434463
2007-07-01	1504637
2007-10-01	1577211
2008-01-01	1686055
2008-04-01	1754085
2008-07-01	1635244
2008-10-01	1616605
2009-01-01	1643866
2009-04-01	1802405
2009-07-01	1882022
2009-10-01	1870711
2010-01-01	1840314
2010-04-01	1693005
2010-07-01	1914791
2010-10-01	1905276
2011-01-01	2011985
2011-04-01	2066806
2011-07-01	1974227
2011-10-01	1959547
2012-01-01	2057106
2012-04-01	1962307
2012-07-01	2039068
2012-10-01	2088047
2013-01-01	2032459
2013-04-01	2085874
2013-07-01	2162005
2013-10-01	2173337
2014-01-01	2177719
2014-04-01	2174465
2014-07-01	2032404
2014-10-01	1968566
2015-01-01	1811634
2015-04-01	1886626
2015-07-01	1872295
2015-10-01	1812701
2016-01-01	1899283
2016-04-01	1883417
2016-07-01	1925009
2016-10-01	1823375
2017-01-01	1894649
2017-04-01	2005880
2017-07-01	2084576
2017-10-01	2103350
2018-01-01	2167853
2018-04-01	2102309