Quarter	US dollars
2004-12-31	3523
2005-03-31	3633
2005-06-30	3897
2005-09-30	4549
2005-12-31	4340
2006-03-31	4350
2006-06-30	4477
2006-09-30	6869
2006-12-31	5135
2007-03-31	5270
2007-06-30	6926
2007-09-30	9863
2007-12-31	8917
2008-03-31	10100
2008-06-30	10961
2008-09-30	10988
2008-12-31	12530
2009-03-31	14135
2009-06-30	18176
2009-09-30	18160
2009-12-31	17587
2010-03-31	20216
2010-06-30	19141
2010-09-30	17342
2010-12-31	20669
2011-03-31	24378
2011-06-30	27388
2011-09-30	24447
2011-12-31	26138
2012-03-31	25263
2012-06-30	27946
2012-09-30	26995
2012-12-31	21701
2013-03-31	21276
2013-06-30	22100
2013-09-30	24591
2013-12-31	26785
2014-03-31	27172
2014-06-30	28752
2014-09-30	27429
2014-12-31	29549
2015-03-31	26578
2015-06-30	28009
2015-09-30	26960
2015-12-31	22790
2016-03-31	23413
2016-06-30	21007
2016-09-30	19276
2016-12-31	21438
2017-03-31	22869
2017-06-30	24633
2017-09-30	23796
2017-12-31	22343
2018-03-31	23188
2018-06-30	18797
2018-09-30	20661
2018-12-31	20782
2019-03-31	20570
2019-06-30	20613
2019-09-30	25497
2019-12-31	22028
2020-03-31	20992
2020-06-30	21477
2020-09-30	20142
2020-12-31	19387
2021-03-31	22905
2021-06-30	23458
2021-09-30	22757
2021-12-31	23787
2022-03-31	19305
2022-06-30	22038
2022-09-30	22478
2022-12-31	23846
2023-03-31	26277
2023-06-30	21718
2023-09-30	20414