Quarter US dollars 2004-12-31 156 2005-03-31 185 2005-06-30 99 2005-09-30 74 2005-12-31 115 2006-03-31 125 2006-06-30 137 2006-09-30 148 2006-12-31 127 2007-03-31 104 2007-06-30 100 2007-09-30 130 2007-12-31 239 2008-03-31 199 2008-06-30 109 2008-09-30 98 2008-12-31 76 2009-03-31 79 2009-06-30 84 2009-09-30 150 2009-12-31 140 2010-03-31 156 2010-06-30 177 2010-09-30 173 2010-12-31 229 2011-03-31 168 2011-06-30 135 2011-09-30 142 2011-12-31 611 2012-03-31 642 2012-06-30 215 2012-09-30 228 2012-12-31 202 2013-03-31 96 2013-06-30 112 2013-09-30 49 2013-12-31 38 2014-03-31 105 2014-06-30 207 2014-09-30 248 2014-12-31 81 2015-03-31 123 2015-06-30 159 2015-09-30 70 2015-12-31 77 2016-03-31 46 2016-06-30 78 2016-09-30 194 2016-12-31 82 2017-03-31 188 2017-06-30 74 2017-09-30 20 2017-12-31 14 2018-03-31 44 2018-06-30 29 2018-09-30 47 2018-12-31 31 2019-03-31 31 2019-06-30 33 2019-09-30 32 2019-12-31 29 2020-03-31 32 2020-06-30 4 2020-09-30 1 2020-12-31 14 2021-03-31 14 2021-06-30 12 2021-09-30 11 2021-12-31 11 2022-03-31 11 2022-06-30 12 2022-09-30 11 2022-12-31 2 2023-03-31 0 2023-06-30 8 2023-09-30 7