Quarter US dollars 2004-12-31 207 2005-03-31 216 2005-06-30 289 2005-09-30 242 2005-12-31 244 2006-03-31 392 2006-06-30 294 2006-09-30 290 2006-12-31 268 2007-03-31 537 2007-06-30 379 2007-09-30 803 2007-12-31 492 2008-03-31 986 2008-06-30 607 2008-09-30 1050 2008-12-31 998 2009-03-31 920 2009-06-30 748 2009-09-30 1121 2009-12-31 1134 2010-03-31 1423 2010-06-30 1318 2010-09-30 2631 2010-12-31 3206 2011-03-31 2648 2011-06-30 2534 2011-09-30 2868 2011-12-31 4380 2012-03-31 3748 2012-06-30 3383 2012-09-30 3785 2012-12-31 2587 2013-03-31 2323 2013-06-30 2270 2013-09-30 2897 2013-12-31 3069 2014-03-31 3018 2014-06-30 4228 2014-09-30 4152 2014-12-31 4779 2015-03-31 4681 2015-06-30 3637 2015-09-30 3329 2015-12-31 3241 2016-03-31 2420 2016-06-30 2463 2016-09-30 1519 2016-12-31 1051 2017-03-31 1052 2017-06-30 1606 2017-09-30 1717 2017-12-31 1629 2018-03-31 761 2018-06-30 817 2018-09-30 982 2018-12-31 895 2019-03-31 955 2019-06-30 476 2019-09-30 648 2019-12-31 666 2020-03-31 460 2020-06-30 342 2020-09-30 542 2020-12-31 643 2021-03-31 2372 2021-06-30 4269 2021-09-30 5679 2021-12-31 7430 2022-03-31 7988 2022-06-30 889 2022-09-30 6046 2022-12-31 7574 2023-03-31 7485 2023-06-30 6711 2023-09-30 1026