Quarter	Millions of US Dollars
1974-07-01	44
1974-10-01	132
1975-01-01	383
1975-04-01	544
1975-07-01	583
1975-10-01	597
1976-01-01	613
1976-04-01	651
1976-07-01	727
1976-10-01	782
1977-01-01	991
1977-04-01	1080
1977-07-01	1272
1977-10-01	1551
1978-01-01	1757
1978-04-01	1785
1978-07-01	2077
1978-10-01	2381
1979-01-01	2450
1979-04-01	2561
1979-07-01	2815
1979-10-01	2788
1980-01-01	2456
1980-04-01	2807
1980-07-01	2942
1980-10-01	2788
1981-01-01	2657
1981-04-01	2481
1981-07-01	2658
1981-10-01	2805
1982-01-01	2639
1982-04-01	2570
1982-07-01	2493
1982-10-01	2719
1983-01-01	2840
1983-04-01	2822
1983-07-01	2907
1983-10-01	2843
1984-01-01	3019
1984-04-01	2836
1984-07-01	2709
1984-10-01	2577
1985-01-01	2675
1985-04-01	2883
1985-07-01	3437
1985-10-01	3318
1986-01-01	4092
1986-04-01	4805
1986-07-01	5272
1986-10-01	5571
1987-01-01	6606
1987-04-01	6953
1987-07-01	7127
1987-10-01	8769
1988-01-01	10186
1988-04-01	9966
1988-07-01	10069
1988-10-01	10576
1989-01-01	10540
1989-04-01	10633
1989-07-01	11036
1989-10-01	11509
1990-01-01	12374
1990-04-01	12839
1990-07-01	13724
1990-10-01	14010
1991-01-01	13691
1991-04-01	13264
1991-07-01	13873
1991-10-01	15266
1992-01-01	15113
1992-04-01	16774
1992-07-01	17635
1992-10-01	16268
1993-01-01	17608
1993-04-01	18260
1993-07-01	19610
1993-10-01	19205
1994-01-01	21946
1994-04-01	23442
1994-07-01	24021
1994-10-01	25042
1995-01-01	30545
1995-04-01	31367
1995-07-01	29566
1995-10-01	29495
1996-01-01	31238
1996-04-01	30697
1996-07-01	30322
1996-10-01	29161
1997-01-01	28089
1997-04-01	28236
1997-07-01	28078
1997-10-01	26945
1998-01-01	27055
1998-04-01	27718
1998-07-01	30521
1998-10-01	33308
1999-01-01	35620
1999-04-01	36227
1999-07-01	35195
1999-10-01	33195
2000-01-01	35719
2000-04-01	35107
2000-07-01	32028
2000-10-01	30224
2001-01-01	33007
2001-04-01	31908
2001-07-01	33605
2001-10-01	31579
2002-01-01	38061
2002-04-01	42291
2002-07-01	41905
2002-10-01	43021
2003-01-01	50661
2003-04-01	59383
2003-07-01	59596
2003-10-01	61770
2004-01-01	65087
2004-04-01	67565
2004-07-01	68997
2004-10-01	69812
2005-01-01	74903
2005-04-01	77855
2005-07-01	75536
2005-10-01	69551
2006-01-01	75847
2006-04-01	85965
2006-07-01	83446
2006-10-01	82210
2007-01-01	93891
2007-04-01	103020
2007-07-01	116085
2007-10-01	96641
2008-01-01	114463
2008-04-01	113125
2008-07-01	102085
2008-10-01	105732
2009-01-01	108524
2009-04-01	113068
2009-07-01	112830
2009-10-01	109866
2010-01-01	109595
2010-04-01	100675
2010-07-01	106485
2010-10-01	103269
2011-01-01	118976
2011-04-01	119413
2011-07-01	110871
2011-10-01	104313
2012-01-01	103589
2012-04-01	99238
2012-07-01	103042
2012-10-01	103002
2013-01-01	101983
2013-04-01	103606
2013-07-01	117415
2013-10-01	113148
2014-01-01	111154
2014-04-01	115942
2014-07-01	103406
2014-10-01	103502
2015-01-01	94432
2015-04-01	102681
2015-07-01	97507
2015-10-01	93101
2016-01-01	104386
2016-04-01	99442
2016-07-01	95293
2016-10-01	96560
2017-01-01	98154
2017-04-01	108117
2017-07-01	114229
2017-10-01	113274
2018-01-01	118571
2018-04-01	110746