Quarter	US dollars
1997-09-30	9834
1997-12-31	10533
1998-03-31	10993
1998-06-30	11191
1998-09-30	13736
1998-12-31	11615
1999-03-31	13438
1999-06-30	12360
1999-09-30	13438
1999-12-31	12786
2000-03-31	13943
2000-06-30	13082
2000-09-30	12805
2000-12-31	13793
2001-03-31	13283
2001-06-30	13535
2001-09-30	16100
2001-12-31	18903
2002-03-31	19274
2002-06-30	23816
2002-09-30	25785
2002-12-31	27255
2003-03-31	27543
2003-06-30	30653
2003-09-30	35334
2003-12-31	38519
2004-03-31	39570
2004-06-30	39656
2004-09-30	42984
2004-12-31	65630
2005-03-31	66096
2005-06-30	72971
2005-09-30	77557
2005-12-31	78278
2006-03-31	80131
2006-06-30	84548
2006-09-30	88108
2006-12-31	96938
2007-03-31	100042
2007-06-30	110818
2007-09-30	127785
2007-12-31	127747
2008-03-31	113557
2008-06-30	117546
2008-09-30	108535
2008-12-31	97700
2009-03-31	96658
2009-06-30	95736
2009-09-30	87191
2009-12-31	78627
2010-03-31	80123
2010-06-30	74003
2010-09-30	82126
2010-12-31	80161
2011-03-31	82185
2011-06-30	81711
2011-09-30	90140
2011-12-31	78673
2012-03-31	83072
2012-06-30	74435
2012-09-30	68505
2012-12-31	72293
2013-03-31	64397
2013-06-30	57863
2013-09-30	53922
2013-12-31	59916
2014-03-31	61052
2014-06-30	62050
2014-09-30	57717
2014-12-31	55507
2015-03-31	55074
2015-06-30	61499
2015-09-30	60168
2015-12-31	63846
2016-03-31	73248
2016-06-30	68981
2016-09-30	64936
2016-12-31	62029
2017-03-31	64685
2017-06-30	69402
2017-09-30	65210
2017-12-31	63625
2018-03-31	69619
2018-06-30	70092
2018-09-30	66027
2018-12-31	65320
2019-03-31	59642
2019-06-30	64828
2019-09-30	69495
2019-12-31	74038
2020-03-31	73172
2020-06-30	63732
2020-09-30	69482
2020-12-31	70593
2021-03-31	70738
2021-06-30	73781
2021-09-30	73948
2021-12-31	73425
2022-03-31	72053
2022-06-30	73535
2022-09-30	67934
2022-12-31	70687
2023-03-31	70654
2023-06-30	74957
2023-09-30	73354