Quarter	Millions of US Dollars
1971-10-01	15
1972-01-01	79
1972-04-01	79
1972-07-01	117
1972-10-01	163
1973-01-01	224
1973-04-01	253
1973-07-01	319
1973-10-01	303
1974-01-01	328
1974-04-01	328
1974-07-01	328
1974-10-01	376
1975-01-01	471
1975-04-01	489
1975-07-01	506
1975-10-01	577
1976-01-01	582
1976-04-01	606
1976-07-01	621
1976-10-01	670
1977-01-01	689
1977-04-01	727
1977-07-01	741
1977-10-01	852
1978-01-01	988
1978-04-01	1050
1978-07-01	1192
1978-10-01	1191
1979-01-01	1141
1979-04-01	1187
1979-07-01	1257
1979-10-01	1246
1980-01-01	1087
1980-04-01	1121
1980-07-01	1061
1980-10-01	1002
1981-01-01	957
1981-04-01	925
1981-07-01	938
1981-10-01	973
1982-01-01	994
1982-04-01	961
1982-07-01	943
1982-10-01	966
1983-01-01	996
1983-04-01	1003
1983-07-01	987
1983-10-01	931
1984-01-01	1049
1984-04-01	1161
1984-07-01	1144
1984-10-01	1099
1985-01-01	1242
1985-04-01	1240
1985-07-01	1335
1985-10-01	1403
1986-01-01	1670
1986-04-01	1797
1986-07-01	1861
1986-10-01	2045
1987-01-01	2183
1987-04-01	2294
1987-07-01	2381
1987-10-01	2761
1988-01-01	3009
1988-04-01	3139
1988-07-01	2934
1988-10-01	3090
1989-01-01	2933
1989-04-01	2868
1989-07-01	3105
1989-10-01	3326
1990-01-01	3498
1990-04-01	3586
1990-07-01	3880
1990-10-01	4003
1991-01-01	3566
1991-04-01	3677
1991-07-01	3963
1991-10-01	4162
1992-01-01	3945
1992-04-01	4333
1992-07-01	4451
1992-10-01	3856
1993-01-01	3576
1993-04-01	3361
1993-07-01	3728
1993-10-01	3217
1994-01-01	2978
1994-04-01	2883
1994-07-01	2979
1994-10-01	2814
1995-01-01	2920
1995-04-01	3026
1995-07-01	2765
1995-10-01	2688
1996-01-01	2652
1996-04-01	2276
1996-07-01	2300
1996-10-01	2147
1997-01-01	2249
1997-04-01	2245
1997-07-01	1966
1997-10-01	3163
1998-01-01	3063
1998-04-01	2978
1998-07-01	3007
1998-10-01	3049
1999-01-01	3197
1999-04-01	3485
1999-07-01	3335
1999-10-01	3668
2000-01-01	4232
2000-04-01	5196
2000-07-01	5168
2000-10-01	6053
2001-01-01	6717
2001-04-01	7476
2001-07-01	7518
2001-10-01	7627
2002-01-01	7642
2002-04-01	8600
2002-07-01	7736
2002-10-01	8772
2003-01-01	8834
2003-04-01	9044
2003-07-01	12216
2003-10-01	14430
2004-01-01	14128
2004-04-01	14697
2004-07-01	15287
2004-10-01	16804
2005-01-01	13724
2005-04-01	13740
2005-07-01	13708
2005-10-01	13377
2006-01-01	13387
2006-04-01	16206
2006-07-01	16080
2006-10-01	15603
2007-01-01	15440
2007-04-01	15504
2007-07-01	16125
2007-10-01	16156
2008-01-01	16280
2008-04-01	15632
2008-07-01	14316
2008-10-01	13578
2009-01-01	17226
2009-04-01	21277
2009-07-01	22574
2009-10-01	21873
2010-01-01	21000
2010-04-01	19363
2010-07-01	22869
2010-10-01	21521
2011-01-01	22608
2011-04-01	23378
2011-07-01	21740
2011-10-01	20839
2012-01-01	25504
2012-04-01	24502
2012-07-01	27486
2012-10-01	30763
2013-01-01	30408
2013-04-01	31655
2013-07-01	33339
2013-10-01	33074
2014-01-01	31698
2014-04-01	29273
2014-07-01	27313
2014-10-01	25582
2015-01-01	24159
2015-04-01	24703
2015-07-01	22061
2015-10-01	21534
2016-01-01	23124
2016-04-01	20921
2016-07-01	20735
2016-10-01	19634
2017-01-01	19911
2017-04-01	21756
2017-07-01	22433
2017-10-01	21642
2018-01-01	22064
2018-04-01	20818