Quarter US dollars 2004-12-31 171 2005-03-31 62 2005-06-30 61 2005-09-30 64 2005-12-31 51 2006-03-31 40 2006-06-30 46 2006-09-30 88 2006-12-31 72 2007-03-31 194 2007-06-30 154 2007-09-30 208 2007-12-31 209 2008-03-31 471 2008-06-30 316 2008-09-30 355 2008-12-31 306 2009-03-31 318 2009-06-30 318 2009-09-30 283 2009-12-31 294 2010-03-31 323 2010-06-30 358 2010-09-30 411 2010-12-31 533 2011-03-31 443 2011-06-30 513 2011-09-30 492 2011-12-31 524 2012-03-31 539 2012-06-30 778 2012-09-30 677 2012-12-31 703 2013-03-31 685 2013-06-30 689 2013-09-30 632 2013-12-31 587 2014-03-31 625 2014-06-30 578 2014-09-30 579 2014-12-31 601 2015-03-31 579 2015-06-30 569 2015-09-30 592 2015-12-31 723 2016-03-31 572 2016-06-30 548 2016-09-30 517 2016-12-31 559 2017-03-31 572 2017-06-30 579 2017-09-30 644 2017-12-31 609 2018-03-31 622 2018-06-30 730 2018-09-30 848 2018-12-31 558 2019-03-31 577 2019-06-30 774 2019-09-30 814 2019-12-31 816 2020-03-31 930 2020-06-30 969 2020-09-30 993 2020-12-31 981 2021-03-31 917 2021-06-30 924 2021-09-30 841 2021-12-31 799 2022-03-31 941 2022-06-30 910 2022-09-30 1032 2022-12-31 1082 2023-03-31 1082 2023-06-30 1023 2023-09-30 533