Quarter US dollars 2004-12-31 156 2005-03-31 147 2005-06-30 177 2005-09-30 161 2005-12-31 153 2006-03-31 241 2006-06-30 181 2006-09-30 189 2006-12-31 221 2007-03-31 178 2007-06-30 171 2007-09-30 169 2007-12-31 269 2008-03-31 246 2008-06-30 271 2008-09-30 274 2008-12-31 165 2009-03-31 162 2009-06-30 181 2009-09-30 142 2009-12-31 396 2010-03-31 384 2010-06-30 536 2010-09-30 815 2010-12-31 636 2011-03-31 160 2011-06-30 217 2011-09-30 319 2011-12-31 243 2012-03-31 184 2012-06-30 249 2012-09-30 140 2012-12-31 165 2013-03-31 267 2013-06-30 126 2013-09-30 147 2013-12-31 235 2014-03-31 122 2014-06-30 164 2014-09-30 503 2014-12-31 400 2015-03-31 327 2015-06-30 282 2015-09-30 309 2015-12-31 437 2016-03-31 339 2016-06-30 320 2016-09-30 321 2016-12-31 203 2017-03-31 246 2017-06-30 136 2017-09-30 240 2017-12-31 503 2018-03-31 462 2018-06-30 420 2018-09-30 424 2018-12-31 391 2019-03-31 446 2019-06-30 518 2019-09-30 474 2019-12-31 445 2020-03-31 218 2020-06-30 104 2020-09-30 253 2020-12-31 96 2021-03-31 102 2021-06-30 314 2021-09-30 256 2021-12-31 202 2022-03-31 357 2022-06-30 238 2022-09-30 185 2022-12-31 174 2023-03-31 310 2023-06-30 345 2023-09-30 494