Quarter	Billions of US Dollars
1997-01-01	0.22873
1997-04-01	0.22873
1997-07-01	0.22873
1997-10-01	0.22873
1998-01-01	0.22873
1998-04-01	0.22873
1998-07-01	0.22873
1998-10-01	0.22873
1999-01-01	0.22873
1999-04-01	0.22873
1999-07-01	0.22873
1999-10-01	0.22873
2000-01-01	0.22873
2000-04-01	0.22873
2000-07-01	0.22873
2000-10-01	0.22873
2001-01-01	0.22873
2001-04-01	0.22873
2001-07-01	0.22873
2001-10-01	0.22873
2002-01-01	0.22530
2002-04-01	0.22530
2002-07-01	0.22187
2002-10-01	0.22187
2003-01-01	0.21730
2003-04-01	0.21730
2003-07-01	0.21273
2003-10-01	0.21273
2004-01-01	0.20816
2004-04-01	0.20816
2004-07-01	0.20359
2004-10-01	0.20359
2005-01-01	0.19902
2005-04-01	0.19902
2005-07-01	0.19445
2005-10-01	0.37140
2006-01-01	0.36915
2006-04-01	0.37828
2006-07-01	0.37063
2006-10-01	0.37828
2007-01-01	0.37364
2007-04-01	0.37644
2007-07-01	0.37969
2007-10-01	0.38782
2008-01-01	0.39390
2008-04-01	0.39318
2008-07-01	0.36097
2008-10-01	0.35518
2009-01-01	0.33004
2009-04-01	0.34243
2009-07-01	0.59030
2009-10-01	0.58260
2010-01-01	0.53646
2010-04-01	0.49720
2010-07-01	0.52595
2010-10-01	0.51665
2011-01-01	0.52352
2011-04-01	0.53152
2011-07-01	0.48004
2011-10-01	0.46171
2012-01-01	0.45467
2012-04-01	0.42977
2012-07-01	0.42023
2012-10-01	0.42881
2013-01-01	0.19207
2013-04-01	0.19620
2013-07-01	0.20258
2013-10-01	0.20686
2014-01-01	0.20682
2014-04-01	0.20487
2014-07-01	0.81790
2014-10-01	0.78917
2015-01-01	0.69934
2015-04-01	0.72728