Quarter	US dollars
1999-03-31	1156
1999-06-30	1110
1999-09-30	1092
1999-12-31	1092
2000-03-31	1110
2000-06-30	1083
2000-09-30	1188
2000-12-31	918
2001-03-31	832
2001-06-30	1015
2001-09-30	1063
2001-12-31	1096
2002-03-31	1121
2002-06-30	1194
2002-09-30	1230
2002-12-31	1537
2003-03-31	1883
2003-06-30	2223
2003-09-30	2874
2003-12-31	3109
2004-03-31	3703
2004-06-30	4431
2004-09-30	4274
2004-12-31	4494
2005-03-31	5085
2005-06-30	5343
2005-09-30	6356
2005-12-31	5856
2006-03-31	5698
2006-06-30	5992
2006-09-30	7290
2006-12-31	7249
2007-03-31	8170
2007-06-30	8629
2007-09-30	11005
2007-12-31	11498
2008-03-31	15155
2008-06-30	16103
2008-09-30	15518
2008-12-31	13792
2009-03-31	13713
2009-06-30	13428
2009-09-30	12339
2009-12-31	13601
2010-03-31	17367
2010-06-30	15819
2010-09-30	16063
2010-12-31	18278
2011-03-31	20737
2011-06-30	22633
2011-09-30	22750
2011-12-31	19762
2012-03-31	21217
2012-06-30	20059
2012-09-30	22311
2012-12-31	24387
2013-03-31	25364
2013-06-30	25428
2013-09-30	24684
2013-12-31	23773
2014-03-31	21536
2014-06-30	22315
2014-09-30	18858
2014-12-31	18867
2015-03-31	20415
2015-06-30	19444
2015-09-30	17108
2015-12-31	15214
2016-03-31	14281
2016-06-30	11010
2016-09-30	11404
2016-12-31	11836
2017-03-31	12921
2017-06-30	12962
2017-09-30	14442
2017-12-31	15868
2018-03-31	16828
2018-06-30	16951
2018-09-30	18162
2018-12-31	16816
2019-03-31	18177
2019-06-30	17919
2019-09-30	16838
2019-12-31	14152
2020-03-31	14220
2020-06-30	11931
2020-09-30	12290
2020-12-31	10399
2021-03-31	11672
2021-06-30	10771
2021-09-30	11213
2021-12-31	16447
2022-03-31	17088
2022-06-30	15135
2022-09-30	19550
2022-12-31	16075
2023-03-31	15478
2023-06-30	11649
2023-09-30	15856