Quarter	Millions of US Dollars
1996-04-01	30
1996-07-01	30
1996-10-01	30
1997-01-01	30
1997-04-01	156
1997-07-01	153
1997-10-01	151
1998-01-01	153
1998-04-01	152
1998-07-01	150
1998-10-01	151
1999-01-01	136
1999-04-01	137
1999-07-01	135
1999-10-01	134
2000-01-01	134
2000-04-01	74
2000-07-01	74
2000-10-01	74
2001-01-01	74
2001-04-01	44
2001-07-01	44
2001-10-01	32
2002-01-01	32
2011-10-01	233
2012-01-01	941
2012-04-01	928
2012-07-01	934
2012-10-01	938
2013-01-01	931
2013-04-01	936
2013-07-01	944
2013-10-01	949
2014-01-01	949
2014-04-01	954
2014-07-01	937
2014-10-01	936
2015-01-01	910
2015-04-01	918
2015-07-01	918
2015-10-01	912
2016-01-01	921
2016-04-01	915
2016-07-01	914
2016-10-01	712
2017-01-01	713
2017-04-01	714
2017-07-01	1304
2017-10-01	1314
2018-01-01	1331
2018-04-01	1296