Quarter	Millions of US Dollars
1971-01-01	11
1971-04-01	11
1971-07-01	12
1971-10-01	12
1972-01-01	12
1972-04-01	39
1972-07-01	38
1972-10-01	39
1973-01-01	45
1973-04-01	48
1973-07-01	48
1973-10-01	46
1974-01-01	53
1974-04-01	53
1974-07-01	52
1974-10-01	59
1975-01-01	59
1975-04-01	59
1975-07-01	73
1975-10-01	76
1976-01-01	78
1976-04-01	79
1976-07-01	80
1976-10-01	78
1977-01-01	96
1977-04-01	98
1977-07-01	125
1977-10-01	139
1978-01-01	147
1978-04-01	146
1978-07-01	182
1978-10-01	180
1979-01-01	203
1979-04-01	205
1979-07-01	704
1979-10-01	935
1980-01-01	835
1980-04-01	931
1980-07-01	907
1980-10-01	849
1981-01-01	845
1981-04-01	756
1981-07-01	753
1981-10-01	771
1982-01-01	716
1982-04-01	694
1982-07-01	674
1982-10-01	717
1983-01-01	698
1983-04-01	671
1983-07-01	694
1983-10-01	676
1984-01-01	686
1984-04-01	640
1984-07-01	545
1984-10-01	605
1985-01-01	606
1985-04-01	567
1985-07-01	668
1985-10-01	713
1986-01-01	805
1986-04-01	856
1986-07-01	1064
1986-10-01	1192
1987-01-01	1356
1987-04-01	1324
1987-07-01	1253
1987-10-01	1465
1988-01-01	1460
1988-04-01	1405
1988-07-01	1380
1988-10-01	1424
1989-01-01	1374
1989-04-01	1347
1989-07-01	1013
1989-10-01	817
1990-01-01	813
1990-04-01	821
1990-07-01	770
1990-10-01	689
1991-01-01	604
1991-04-01	586
1991-07-01	607
1991-10-01	546
1992-01-01	295
1992-04-01	317
1992-07-01	300
1992-10-01	168
1993-01-01	175
1993-04-01	337
1993-07-01	244
1993-10-01	234
1994-01-01	242
1994-04-01	293
1994-07-01	371
1994-10-01	377
1995-01-01	1148
1995-04-01	1145
1995-07-01	1400
1995-10-01	1683
1996-01-01	1647
1996-04-01	1538
1996-07-01	1625
1996-10-01	1659
1997-01-01	1562
1997-04-01	1748
1997-07-01	1985
1997-10-01	1882
1998-01-01	1939
1998-04-01	1549
1998-07-01	1587
1998-10-01	2270
1999-01-01	1889
1999-04-01	1743
1999-07-01	1865
1999-10-01	1820
2000-01-01	1741
2000-04-01	1816
2000-07-01	1664
2000-10-01	1647
2001-01-01	1607
2001-04-01	1661
2001-07-01	2347
2001-10-01	2693
2002-01-01	2705
2002-04-01	3140
2002-07-01	3584
2002-10-01	3731
2003-01-01	4000
2003-04-01	4961
2003-07-01	5342
2003-10-01	7670
2004-01-01	8513
2004-04-01	10406
2004-07-01	10369
2004-10-01	11944
2005-01-01	11541
2005-04-01	10374
2005-07-01	10257
2005-10-01	11630
2006-01-01	12545
2006-04-01	13584
2006-07-01	12187
2006-10-01	15510
2007-01-01	15737
2007-04-01	17677
2007-07-01	15679
2007-10-01	14841
2008-01-01	15301
2008-04-01	15556
2008-07-01	14128
2008-10-01	12408
2009-01-01	14912
2009-04-01	19298
2009-07-01	20320
2009-10-01	22232
2010-01-01	20517
2010-04-01	20501
2010-07-01	22463
2010-10-01	22283
2011-01-01	24604
2011-04-01	28079
2011-07-01	26781
2011-10-01	24442
2012-01-01	26213
2012-04-01	25993
2012-07-01	30275
2012-10-01	31072
2013-01-01	34828
2013-04-01	36009
2013-07-01	40374
2013-10-01	42657
2014-01-01	43894
2014-04-01	44170
2014-07-01	41413
2014-10-01	39821
2015-01-01	36413
2015-04-01	39841
2015-07-01	39251
2015-10-01	41253
2016-01-01	54545
2016-04-01	52247
2016-07-01	52095
2016-10-01	48662
2017-01-01	47842
2017-04-01	52532
2017-07-01	54007
2017-10-01	53533
2018-01-01	57366
2018-04-01	52109