Quarter	US dollars
1999-03-31	12502
1999-06-30	14234
1999-09-30	15497
1999-12-31	14389
2000-03-31	17454
2000-06-30	20534
2000-09-30	24861
2000-12-31	20684
2001-03-31	22109
2001-06-30	24912
2001-09-30	21670
2001-12-31	23457
2002-03-31	22770
2002-06-30	26413
2002-09-30	27463
2002-12-31	30201
2003-03-31	30057
2003-06-30	29994
2003-09-30	31017
2003-12-31	37429
2004-03-31	41093
2004-06-30	47943
2004-09-30	52269
2004-12-31	56127
2005-03-31	72783
2005-06-30	84587
2005-09-30	87177
2005-12-31	100240
2006-03-31	115542
2006-06-30	131997
2006-09-30	138969
2006-12-31	134441
2007-03-31	156205
2007-06-30	137473
2007-09-30	165166
2007-12-31	156700
2008-03-31	138511
2008-06-30	144243
2008-09-30	161059
2008-12-31	51899
2009-03-31	55271
2009-06-30	48285
2009-09-30	50640
2009-12-31	41158
2010-03-31	49048
2010-06-30	38415
2010-09-30	46610
2010-12-31	44629
2011-03-31	56846
2011-06-30	50770
2011-09-30	48731
2011-12-31	48623
2012-03-31	47943
2012-06-30	50388
2012-09-30	53538
2012-12-31	40557
2013-03-31	55462
2013-06-30	54424
2013-09-30	46508
2013-12-31	48251
2014-03-31	49297
2014-06-30	44954
2014-09-30	35972
2014-12-31	26834
2015-03-31	32981
2015-06-30	32515
2015-09-30	40728
2015-12-31	30102
2016-03-31	26997
2016-06-30	36471
2016-09-30	33708
2016-12-31	31658
2017-03-31	36334
2017-06-30	30992
2017-09-30	26999
2017-12-31	27312
2018-03-31	33228
2018-06-30	26992
2018-09-30	33787
2018-12-31	39598
2019-03-31	38615
2019-06-30	38464
2019-09-30	34221
2019-12-31	38778
2020-03-31	38023
2020-06-30	29411
2020-09-30	28635
2020-12-31	30776
2021-03-31	19578
2021-06-30	24392
2021-09-30	24685
2021-12-31	23641
2022-03-31	22969
2022-06-30	25181
2022-09-30	27349
2022-12-31	22178
2023-03-31	20810
2023-06-30	24570
2023-09-30	26698