Quarter	Millions of US Dollars
1974-10-01	10
1975-01-01	10
1975-04-01	10
1975-07-01	9
1975-10-01	29
1976-01-01	30
1976-04-01	30
1976-07-01	31
1976-10-01	31
1977-01-01	30
1977-04-01	30
1977-07-01	32
1977-10-01	37
1978-01-01	40
1978-04-01	54
1978-07-01	65
1978-10-01	62
1979-01-01	59
1979-04-01	60
1979-07-01	64
1979-10-01	85
1980-01-01	73
1980-04-01	83
1980-07-01	82
1980-10-01	76
1981-01-01	86
1981-04-01	81
1981-07-01	83
1981-10-01	92
1982-01-01	85
1982-04-01	95
1982-07-01	92
1982-10-01	100
1983-01-01	158
1983-04-01	157
1983-07-01	156
1983-10-01	151
1984-01-01	153
1984-04-01	172
1984-07-01	160
1984-10-01	154
1985-01-01	153
1985-04-01	156
1985-07-01	183
1985-10-01	241
1986-01-01	242
1986-04-01	262
1986-07-01	285
1986-10-01	290
1987-01-01	379
1987-04-01	352
1987-07-01	350
1987-10-01	466
1988-01-01	436
1988-04-01	524
1988-07-01	526
1988-10-01	587
1989-01-01	534
1989-04-01	488
1989-07-01	536
1989-10-01	546
1990-01-01	562
1990-04-01	590
1990-07-01	643
1990-10-01	575
1991-01-01	504
1991-04-01	502
1991-07-01	540
1991-10-01	508
1992-01-01	459
1992-04-01	498
1992-07-01	558
1992-10-01	437
1993-01-01	426
1993-04-01	485
1993-07-01	674
1993-10-01	714
1994-01-01	806
1994-04-01	846
1994-07-01	884
1994-10-01	829
1995-01-01	953
1995-04-01	1031
1995-07-01	1122
1995-10-01	1079
1996-01-01	1014
1996-04-01	1041
1996-07-01	817
1996-10-01	774
1997-01-01	659
1997-04-01	663
1997-07-01	663
1997-10-01	596
1998-01-01	569
1998-04-01	511
1998-07-01	554
1998-10-01	554
1999-01-01	518
1999-04-01	594
1999-07-01	617
1999-10-01	613
2000-01-01	530
2000-04-01	536
2000-07-01	505
2000-10-01	685
2001-01-01	650
2001-04-01	544
2001-07-01	754
2001-10-01	726
2002-01-01	896
2002-04-01	1034
2002-07-01	967
2002-10-01	1060
2003-01-01	1021
2003-04-01	962
2003-07-01	1137
2003-10-01	1213
2004-01-01	1272
2004-04-01	1288
2004-07-01	1291
2004-10-01	1552
2005-01-01	1481
2005-04-01	1581
2005-07-01	1572
2005-10-01	1353
2006-01-01	1561
2006-04-01	1664
2006-07-01	1642
2006-10-01	1594
2007-01-01	1598
2007-04-01	1798
2007-07-01	1882
2007-10-01	1772
2008-01-01	1987
2008-04-01	2281
2008-07-01	1920
2008-10-01	1974
2009-01-01	1745
2009-04-01	2099
2009-07-01	2165
2009-10-01	2553
2010-01-01	2483
2010-04-01	2614
2010-07-01	2897
2010-10-01	3014
2011-01-01	2862
2011-04-01	3053
2011-07-01	2829
2011-10-01	2714
2012-01-01	2828
2012-04-01	1831
2012-07-01	2137
2012-10-01	2186
2013-01-01	2415
2013-04-01	2438
2013-07-01	2265
2013-10-01	2528
2014-01-01	2261
2014-04-01	1910
2014-07-01	1773
2014-10-01	1717
2015-01-01	1748
2015-04-01	2042
2015-07-01	1950
2015-10-01	2010
2016-01-01	2083
2016-04-01	1839
2016-07-01	1847
2016-10-01	1816
2017-01-01	1849
2017-04-01	1958
2017-07-01	1932
2017-10-01	2127
2018-01-01	2170
2018-04-01	2091