Quarter US dollars 2004-12-31 307 2005-03-31 335 2005-06-30 358 2005-09-30 361 2005-12-31 280 2006-03-31 319 2006-06-30 399 2006-09-30 445 2006-12-31 393 2007-03-31 439 2007-06-30 610 2007-09-30 752 2007-12-31 842 2008-03-31 1240 2008-06-30 1240 2008-09-30 964 2008-12-31 704 2009-03-31 1042 2009-06-30 749 2009-09-30 537 2009-12-31 669 2010-03-31 764 2010-06-30 1091 2010-09-30 778 2010-12-31 1058 2011-03-31 1092 2011-06-30 1431 2011-09-30 1505 2011-12-31 1426 2012-03-31 1515 2012-06-30 1752 2012-09-30 1528 2012-12-31 1588 2013-03-31 1274 2013-06-30 1541 2013-09-30 1524 2013-12-31 1337 2014-03-31 1254 2014-06-30 1607 2014-09-30 1783 2014-12-31 1308 2015-03-31 1437 2015-06-30 1523 2015-09-30 1194 2015-12-31 975 2016-03-31 1098 2016-06-30 924 2016-09-30 1020 2016-12-31 1016 2017-03-31 1476 2017-06-30 1876 2017-09-30 1902 2017-12-31 1924 2018-03-31 2266 2018-06-30 2357 2018-09-30 2109 2018-12-31 1881 2019-03-31 2472 2019-06-30 2248 2019-09-30 2433 2019-12-31 2423 2020-03-31 2531 2020-06-30 2490 2020-09-30 2565 2020-12-31 2532 2021-03-31 3214 2021-06-30 3604 2021-09-30 4444 2021-12-31 3918 2022-03-31 4076 2022-06-30 3662 2022-09-30 4108 2022-12-31 3336 2023-03-31 2521 2023-06-30 2348 2023-09-30 2089