Quarter US dollars 2004-12-31 269 2005-03-31 127 2005-06-30 231 2005-09-30 237 2005-12-31 180 2006-03-31 194 2006-06-30 264 2006-09-30 323 2006-12-31 221 2007-03-31 218 2007-06-30 207 2007-09-30 159 2007-12-31 241 2008-03-31 242 2008-06-30 171 2008-09-30 242 2008-12-31 293 2009-03-31 426 2009-06-30 591 2009-09-30 414 2009-12-31 373 2010-03-31 520 2010-06-30 1197 2010-09-30 1139 2010-12-31 318 2011-03-31 351 2011-06-30 583 2011-09-30 897 2011-12-31 686 2012-03-31 372 2012-06-30 524 2012-09-30 640 2012-12-31 915 2013-03-31 547 2013-06-30 740 2013-09-30 411 2013-12-31 668 2014-03-31 562 2014-06-30 614 2014-09-30 937 2014-12-31 524 2015-03-31 279 2015-06-30 234 2015-09-30 139 2015-12-31 150 2016-03-31 128 2016-06-30 136 2016-09-30 131 2016-12-31 144 2017-03-31 114 2017-06-30 165 2017-09-30 178 2017-12-31 292 2018-03-31 319 2018-06-30 366 2018-09-30 347 2018-12-31 318 2019-03-31 248 2019-06-30 237 2019-09-30 246 2019-12-31 252 2020-03-31 110 2020-06-30 108 2020-09-30 112 2020-12-31 126 2021-03-31 69 2021-06-30 59 2021-09-30 58 2021-12-31 38 2022-03-31 108 2022-06-30 161 2022-09-30 196 2022-12-31 352 2023-03-31 239 2023-06-30 519 2023-09-30 857