Quarter	US dollars
1999-09-30	-21800
1999-12-31	-28902
2000-03-31	-22053
2000-06-30	-27334
2000-09-30	-29375
2000-12-31	-34444
2001-03-31	-29800
2001-06-30	-29274
2001-09-30	-29237
2001-12-31	-25886
2002-03-31	-25270
2002-06-30	-28530
2002-09-30	-27929
2002-12-31	-26793
2003-03-31	-26608
2003-06-30	-25643
2003-09-30	-28075
2003-12-31	-28127
2004-03-31	-27576
2004-06-30	-27308
2004-09-30	-27274
2004-12-31	-30281
2005-03-31	-29382
2005-06-30	-29010
2005-09-30	-28065
2005-12-31	-27367
2006-03-31	-28123
2006-06-30	-27116
2006-09-30	-29428
2006-12-31	-30765
2007-03-31	-29671
2007-06-30	-30000
2007-09-30	-28744
2007-12-31	-33272
2008-03-31	-34252
2008-06-30	-34269
2008-09-30	-27417
2008-12-31	-25884
2009-03-31	-21016
2009-06-30	-22877
2009-09-30	-33720
2009-12-31	-33432
2010-03-31	-36208
2010-06-30	-36362
2010-09-30	-39655
2010-12-31	-40435
2011-03-31	-44368
2011-06-30	-48616
2011-09-30	-48682
2011-12-31	-50236
2012-03-31	-51075
2012-06-30	-53501
2012-09-30	-54232
2012-12-31	-55866
2013-03-31	-55853
2013-06-30	-57821
2013-09-30	-60326
2013-12-31	-63185
2014-03-31	-66955
2014-06-30	-67333
2014-09-30	-65433
2014-12-31	-68038
2015-03-31	-85259
2015-06-30	-85810
2015-09-30	-93085
2015-12-31	-94653
2016-03-31	-100876
2016-06-30	-104355
2016-09-30	-108264
2016-12-31	-99302
2017-03-31	-106077
2017-06-30	-109378
2017-09-30	-109102
2017-12-31	-112944
2018-03-31	-114751
2018-06-30	-112124
2018-09-30	-109764
2018-12-31	-122320
2019-03-31	-113757
2019-06-30	-105037
2019-09-30	-95565
2019-12-31	-111001
2020-03-31	-97276
2020-06-30	-95678
2020-09-30	-87236
2020-12-31	-95306
2021-03-31	-88224
2021-06-30	-85785
2021-09-30	-111850
2021-12-31	-114525
2022-03-31	-113007
2022-06-30	-102710
2022-09-30	-93149
2022-12-31	-103805
2023-03-31	-101911
2023-06-30	-100781
2023-09-30	-100187
2023-12-31	-104598