Quarter	Millions of US Dollars
1974-04-01	17
1977-01-01	38
1977-04-01	37
1977-07-01	44
1978-01-01	114
1978-10-01	76
1979-01-01	30
1979-04-01	-18
1979-07-01	100
1980-07-01	71
1981-10-01	68
1983-01-01	-17
1984-01-01	-21
1984-07-01	-34
1985-01-01	-31
1985-10-01	-29
1986-01-01	-16
1986-07-01	-100
1986-10-01	-84
1987-04-01	-70
1988-01-01	-94
1989-01-01	-22
1990-04-01	862
1990-07-01	-83
1991-10-01	-116
1992-10-01	3348
1993-01-01	150
1996-01-01	-150
1996-07-01	370
1996-10-01	690
1997-10-01	-28
1998-01-01	-57
1998-04-01	472
1998-07-01	-57
1998-10-01	-28
1999-01-01	1635
1999-04-01	582
1999-07-01	-57
1999-10-01	690
2000-01-01	1274
2000-04-01	-318
2000-07-01	267
2000-10-01	-70
2001-01-01	-57
2001-04-01	130
2001-07-01	-57
2001-10-01	770
2002-01-01	1617
2002-04-01	-548
2002-07-01	1242
2002-10-01	170
2003-01-01	967
2003-04-01	-70
2003-07-01	612
2003-10-01	1230
2004-01-01	612
2004-04-01	283
2004-07-01	1069
2004-10-01	-68
2005-01-01	1270
2005-04-01	682
2005-07-01	687
2005-10-01	-270
2006-01-01	2090
2006-04-01	-481
2006-07-01	1524
2006-10-01	-1330
2007-01-01	1000
2007-04-01	-126
2007-07-01	-298
2008-01-01	500
2008-04-01	-740
2009-01-01	564
2009-07-01	750
2009-10-01	1000
2010-01-01	1072
2010-07-01	977
2010-10-01	-359
2011-01-01	1251
2011-10-01	-597
2012-01-01	1287
2012-10-01	750
2013-01-01	-1000
2013-07-01	-249
2014-01-01	-200
2014-07-01	-56
2015-01-01	1450
2016-01-01	750
2016-10-01	-470
2017-01-01	1096
2018-01-01	2461