Quarter	US dollars
1999-09-30	22963
1999-12-31	30077
2000-03-31	24338
2000-06-30	30783
2000-09-30	33837
2000-12-31	39281
2001-03-31	35256
2001-06-30	34818
2001-09-30	34662
2001-12-31	31939
2002-03-31	31727
2002-06-30	34583
2002-09-30	34481
2002-12-31	32790
2003-03-31	31738
2003-06-30	31196
2003-09-30	33694
2003-12-31	35147
2004-03-31	35509
2004-06-30	35715
2004-09-30	35933
2004-12-31	39482
2005-03-31	38961
2005-06-30	39142
2005-09-30	38624
2005-12-31	40918
2006-03-31	40843
2006-06-30	40161
2006-09-30	43125
2006-12-31	45064
2007-03-31	44736
2007-06-30	44854
2007-09-30	43840
2007-12-31	47375
2008-03-31	48598
2008-06-30	48000
2008-09-30	41487
2008-12-31	37547
2009-03-31	33431
2009-06-30	37665
2009-09-30	35533
2009-12-31	35450
2010-03-31	40557
2010-06-30	41097
2010-09-30	45455
2010-12-31	44792
2011-03-31	49586
2011-06-30	53724
2011-09-30	55822
2011-12-31	55235
2012-03-31	58310
2012-06-30	61674
2012-09-30	63380
2012-12-31	64983
2013-03-31	64833
2013-06-30	67220
2013-09-30	72091
2013-12-31	73921
2014-03-31	79824
2014-06-30	80101
2014-09-30	77825
2014-12-31	77737
2015-03-31	95159
2015-06-30	97812
2015-09-30	102089
2015-12-31	102257
2016-03-31	107913
2016-06-30	112726
2016-09-30	115862
2016-12-31	107371
2017-03-31	113306
2017-06-30	119685
2017-09-30	121540
2017-12-31	126454
2018-03-31	131325
2018-06-30	130028
2018-09-30	128402
2018-12-31	142219
2019-03-31	134766
2019-06-30	131144
2019-09-30	125159
2019-12-31	144870
2020-03-31	136762
2020-06-30	136895
2020-09-30	131166
2020-12-31	143143
2021-03-31	137128
2021-06-30	134738
2021-09-30	132820
2021-12-31	133571
2022-03-31	129227
2022-06-30	116992
2022-09-30	105687
2022-12-31	115645
2023-03-31	114011
2023-06-30	113056
2023-09-30	111225
2023-12-31	117024