Quarter	US dollars
1999-09-30	22845
1999-12-31	30087
2000-03-31	24493
2000-06-30	29964
2000-09-30	31681
2000-12-31	38025
2001-03-31	33012
2001-06-30	32898
2001-09-30	32662
2001-12-31	30558
2002-03-31	29868
2002-06-30	33013
2002-09-30	32932
2002-12-31	31897
2003-03-31	29303
2003-06-30	29432
2003-09-30	31223
2003-12-31	33105
2004-03-31	31418
2004-06-30	31489
2004-09-30	32034
2004-12-31	35564
2005-03-31	34932
2005-06-30	35454
2005-09-30	35073
2005-12-31	37349
2006-03-31	36869
2006-06-30	37603
2006-09-30	38986
2006-12-31	40990
2007-03-31	41376
2007-06-30	42123
2007-09-30	39184
2007-12-31	44315
2008-03-31	44274
2008-06-30	42431
2008-09-30	37704
2008-12-31	40487
2009-03-31	37082
2009-06-30	38977
2009-09-30	36921
2009-12-31	35618
2010-03-31	36037
2010-06-30	38878
2010-09-30	42010
2010-12-31	43489
2011-03-31	46819
2011-06-30	49707
2011-09-30	49167
2011-12-31	49691
2012-03-31	51745
2012-06-30	53703
2012-09-30	57353
2012-12-31	59837
2013-03-31	59054
2013-06-30	62429
2013-09-30	65795
2013-12-31	66187
2014-03-31	67341
2014-06-30	73381
2014-09-30	69337
2014-12-31	72092
2015-03-31	85342
2015-06-30	89944
2015-09-30	94635
2015-12-31	95253
2016-03-31	104214
2016-06-30	106197
2016-09-30	105768
2016-12-31	100644
2017-03-31	104906
2017-06-30	113160
2017-09-30	115213
2017-12-31	114355
2018-03-31	116108
2018-06-30	118135
2018-09-30	114090
2018-12-31	137306
2019-03-31	129467
2019-06-30	118279
2019-09-30	121558
2019-12-31	133599
2020-03-31	129367
2020-06-30	130443
2020-09-30	122783
2020-12-31	139832
2021-03-31	123373
2021-06-30	120836
2021-09-30	119859
2021-12-31	123615
2022-03-31	118449
2022-06-30	108830
2022-09-30	97564
2022-12-31	109745
2023-03-31	102329
2023-06-30	102000
2023-09-30	98999
2023-12-31	105913