Quarter US dollars 2004-12-31 252 2005-03-31 335 2005-06-30 312 2005-09-30 348 2005-12-31 429 2006-03-31 413 2006-06-30 405 2006-09-30 316 2006-12-31 335 2007-03-31 322 2007-06-30 245 2007-09-30 263 2007-12-31 221 2008-03-31 260 2008-06-30 247 2008-09-30 244 2008-12-31 262 2009-03-31 334 2009-06-30 324 2009-09-30 318 2009-12-31 446 2010-03-31 455 2010-06-30 582 2010-09-30 531 2010-12-31 512 2011-03-31 500 2011-06-30 459 2011-09-30 559 2011-12-31 615 2012-03-31 582 2012-06-30 786 2012-09-30 657 2012-12-31 445 2013-03-31 812 2013-06-30 799 2013-09-30 1009 2013-12-31 982 2014-03-31 907 2014-06-30 874 2014-09-30 858 2014-12-31 723 2015-03-31 1041 2015-06-30 1096 2015-09-30 1354 2015-12-31 1068 2016-03-31 1441 2016-06-30 1574 2016-09-30 1569 2016-12-31 2028 2017-03-31 1671 2017-06-30 1777 2017-09-30 1874 2017-12-31 1987 2018-03-31 1269 2018-06-30 1487 2018-09-30 1501 2018-12-31 1163 2019-03-31 1136 2019-06-30 1181 2019-09-30 1080 2019-12-31 1122 2020-03-31 1059 2020-06-30 1275 2020-09-30 1043 2020-12-31 1073 2021-03-31 999 2021-06-30 1061 2021-09-30 998 2021-12-31 1353 2022-03-31 1346 2022-06-30 1213 2022-09-30 1179 2022-12-31 1155 2023-03-31 1352 2023-06-30 1129 2023-09-30 1136