Quarter	Billions of US Dollars
1971-01-01	27.369
1971-04-01	28.021
1971-07-01	29.420
1971-10-01	30.945
1972-01-01	31.835
1972-04-01	32.662
1972-07-01	33.498
1972-10-01	36.704
1973-01-01	43.497
1973-04-01	46.247
1973-07-01	51.249
1973-10-01	54.238
1974-01-01	58.153
1974-04-01	62.021
1974-07-01	58.159
1974-10-01	62.294
1975-01-01	65.972
1975-04-01	67.036
1975-07-01	65.798
1975-10-01	68.165
1976-01-01	70.528
1976-04-01	72.582
1976-07-01	75.518
1976-10-01	69.089
1977-01-01	71.598
1977-04-01	74.057
1977-07-01	75.341
1977-10-01	79.035
1978-01-01	81.767
1978-04-01	86.305
1978-07-01	89.174
1978-10-01	92.278
1979-01-01	92.052
1979-04-01	97.458
1979-07-01	101.879
1979-10-01	103.299
1980-01-01	105.053
1980-04-01	118.563
1980-07-01	123.489
1980-10-01	129.214
1981-01-01	132.166
1981-04-01	137.771
1981-07-01	142.779
1981-10-01	146.426
1982-01-01	143.198
1982-04-01	146.192
1982-07-01	140.937
1982-10-01	149.732
1983-01-01	137.701
1983-04-01	144.057
1983-07-01	149.881
1983-10-01	154.819
1984-01-01	165.361
1984-04-01	157.354
1984-07-01	157.126
1984-10-01	161.652
1985-01-01	142.149
1985-04-01	142.933
1985-07-01	157.526
1985-10-01	159.841
1986-01-01	172.589
1986-04-01	174.944
1986-07-01	172.824
1986-10-01	189.869
1987-01-01	207.046
1987-04-01	222.834
1987-07-01	229.143
1987-10-01	244.424
1988-01-01	265.164
1988-04-01	300.877
1988-07-01	309.331
1988-10-01	345.710
1989-01-01	344.571
1989-04-01	337.915
1989-07-01	351.930
1989-10-01	365.547
1990-01-01	362.263
1990-04-01	386.626
1990-07-01	405.905
1990-10-01	385.781
1991-01-01	394.037
1991-04-01	386.326
1991-07-01	397.442
1991-10-01	379.037
1992-01-01	383.402
1992-04-01	375.553
1992-07-01	364.699
1992-10-01	348.900
1993-01-01	357.400
1993-04-01	334.849
1993-07-01	327.094
1993-10-01	344.636
1994-01-01	358.949
1994-04-01	380.390
1994-07-01	393.485
1994-10-01	418.029
1995-01-01	396.880
1995-04-01	396.503
1995-07-01	425.725
1995-10-01	430.365
1996-01-01	461.072
1996-04-01	476.973
1996-07-01	481.177
1996-10-01	496.112
1997-01-01	490.757
1997-04-01	482.069
1997-07-01	476.620
1997-10-01	449.769
1998-01-01	465.637
1998-04-01	449.155
1998-07-01	442.429
1998-10-01	466.639
1999-01-01	489.353
1999-04-01	519.613
1999-07-01	524.130
1999-10-01	541.505
2000-01-01	517.453
2000-04-01	536.251
2000-07-01	496.096
2000-10-01	529.297
2001-01-01	479.993
2001-04-01	502.432
2001-07-01	502.824
2001-10-01	522.626
2002-01-01	556.198
2002-04-01	611.537
2002-07-01	610.738
2002-10-01	645.382
2003-01-01	696.393
2003-04-01	795.895
2003-07-01	830.589
2003-10-01	949.145
2004-01-01	984.043
2004-04-01	926.925
2004-07-01	990.318
2004-10-01	1107.947
2005-01-01	1125.531
2005-04-01	1158.469
2005-07-01	1201.032
2005-10-01	1200.918
2006-01-01	1194.788
2006-04-01	1294.083
2006-07-01	1345.896
2006-10-01	1469.558
2007-01-01	1546.699
2007-04-01	1689.751
2007-07-01	1825.356
2007-10-01	1868.991
2008-01-01	1988.273
2008-04-01	2143.174
2008-07-01	1840.780
2008-10-01	1602.179
2009-01-01	1621.208
2009-04-01	1900.740
2009-07-01	2066.029
2009-10-01	2127.012
2010-01-01	2178.317
2010-04-01	2058.866
2010-07-01	2362.342
2010-10-01	2485.914
2011-01-01	2564.431
2011-04-01	2677.005
2011-07-01	2485.922
2011-10-01	2621.154
2012-01-01	2715.737
2012-04-01	2704.115
2012-07-01	2788.599
2012-10-01	2800.016
2013-01-01	2834.015
2013-04-01	2578.094
2013-07-01	2634.016
2013-10-01	2587.187
2014-01-01	2691.017
2014-04-01	2792.040
2014-07-01	2634.938
2014-10-01	2523.060
2015-01-01	2405.155
2015-04-01	2471.905
2015-07-01	2304.929
2015-10-01	2417.042
2016-01-01	2574.960
2016-04-01	2527.178
2016-07-01	2597.696
2016-10-01	2487.240
2017-01-01	2635.427
2017-04-01	2687.114
2017-07-01	2747.423
2017-10-01	2772.425
2018-01-01	2754.921