Quarter US dollars 2004-12-31 167 2005-03-31 164 2005-06-30 208 2005-09-30 368 2005-12-31 227 2006-03-31 229 2006-06-30 209 2006-09-30 112 2006-12-31 425 2007-03-31 69 2007-06-30 245 2007-09-30 185 2007-12-31 398 2008-03-31 590 2008-06-30 911 2008-09-30 1217 2008-12-31 893 2009-03-31 493 2009-06-30 310 2009-09-30 849 2009-12-31 1492 2010-03-31 1515 2010-06-30 2421 2010-09-30 1656 2010-12-31 1611 2011-03-31 1765 2011-06-30 1639 2011-09-30 1343 2011-12-31 1698 2012-03-31 1240 2012-06-30 2503 2012-09-30 1208 2012-12-31 880 2013-03-31 616 2013-06-30 514 2013-09-30 552 2013-12-31 493 2014-03-31 970 2014-06-30 961 2014-09-30 1036 2014-12-31 765 2015-03-31 1001 2015-06-30 1032 2015-09-30 641 2015-12-31 442 2016-03-31 428 2016-06-30 310 2016-09-30 279 2016-12-31 337 2017-03-31 216 2017-06-30 294 2017-09-30 209 2017-12-31 136 2018-03-31 159 2018-06-30 151 2018-09-30 151 2018-12-31 132 2019-03-31 444 2019-06-30 341 2019-09-30 400 2019-12-31 367 2020-03-31 419 2020-06-30 241 2020-09-30 348 2020-12-31 343 2021-03-31 275 2021-06-30 352 2021-09-30 206 2021-12-31 302 2022-03-31 473 2022-06-30 295 2022-09-30 289 2022-12-31 451 2023-03-31 471 2023-06-30 525 2023-09-30 618