Quarter	US dollars
1997-09-30	1975
1997-12-31	1755
1998-03-31	1780
1998-06-30	1659
1998-09-30	2749
1998-12-31	3191
1999-03-31	3759
1999-06-30	4258
1999-09-30	7438
1999-12-31	8127
2000-03-31	9156
2000-06-30	9906
2000-09-30	8504
2000-12-31	9237
2001-03-31	9180
2001-06-30	9865
2001-09-30	9544
2001-12-31	10366
2002-03-31	11821
2002-06-30	13225
2002-09-30	14425
2002-12-31	15870
2003-03-31	17213
2003-06-30	18898
2003-09-30	18251
2003-12-31	20603
2004-03-31	20329
2004-06-30	22153
2004-09-30	24768
2004-12-31	26303
2005-03-31	29654
2005-06-30	31829
2005-09-30	31486
2005-12-31	30573
2006-03-31	30302
2006-06-30	30086
2006-09-30	30288
2006-12-31	32205
2007-03-31	30538
2007-06-30	41935
2007-09-30	35511
2007-12-31	40308
2008-03-31	42897
2008-06-30	26553
2008-09-30	58428
2008-12-31	49375
2009-03-31	33477
2009-06-30	24867
2009-09-30	22139
2009-12-31	17903
2010-03-31	24809
2010-06-30	24236
2010-09-30	24407
2010-12-31	27500
2011-03-31	28788
2011-06-30	23733
2011-09-30	28554
2011-12-31	27728
2012-03-31	26572
2012-06-30	26805
2012-09-30	27652
2012-12-31	29047
2013-03-31	25110
2013-06-30	24653
2013-09-30	24709
2013-12-31	24405
2014-03-31	25972
2014-06-30	26387
2014-09-30	25899
2014-12-31	25380
2015-03-31	25497
2015-06-30	24965
2015-09-30	25458
2015-12-31	25393
2016-03-31	25485
2016-06-30	25125
2016-09-30	25550
2016-12-31	21962
2017-03-31	19952
2017-06-30	22019
2017-09-30	24877
2017-12-31	25642
2018-03-31	26721
2018-06-30	24867
2018-09-30	20711
2018-12-31	20787
2019-03-31	19201
2019-06-30	21652
2019-09-30	23930
2019-12-31	25593
2020-03-31	22230
2020-06-30	29751
2020-09-30	34552
2020-12-31	36450
2021-03-31	34166
2021-06-30	27187
2021-09-30	27774
2021-12-31	35483
2022-03-31	30964
2022-06-30	26467
2022-09-30	20672
2022-12-31	22597
2023-03-31	24548
2023-06-30	22541
2023-09-30	21705
2023-12-31	23578