Quarter	US dollars
1997-09-30	1867
1997-12-31	3716
1998-03-31	4366
1998-06-30	2800
1998-09-30	2526
1998-12-31	3029
1999-03-31	2850
1999-06-30	3355
1999-09-30	3626
1999-12-31	4344
2000-03-31	4166
2000-06-30	4352
2000-09-30	4476
2000-12-31	4452
2001-03-31	4896
2001-06-30	5138
2001-09-30	5307
2001-12-31	5567
2002-03-31	5578
2002-06-30	6339
2002-09-30	6217
2002-12-31	6394
2003-03-31	6220
2003-06-30	6532
2003-09-30	7028
2003-12-31	7226
2004-03-31	8031
2004-06-30	8490
2004-09-30	8415
2004-12-31	9155
2005-03-31	12102
2005-06-30	10259
2005-09-30	10384
2005-12-31	9246
2006-03-31	10875
2006-06-30	11567
2006-09-30	14430
2006-12-31	12889
2007-03-31	16840
2007-06-30	18269
2007-09-30	20292
2007-12-31	21901
2008-03-31	22512
2008-06-30	21274
2008-09-30	20165
2008-12-31	18674
2009-03-31	17420
2009-06-30	17960
2009-09-30	18658
2009-12-31	17616
2010-03-31	16791
2010-06-30	16051
2010-09-30	16673
2010-12-31	14810
2011-03-31	14952
2011-06-30	10193
2011-09-30	10072
2011-12-31	11027
2012-03-31	13186
2012-06-30	11527
2012-09-30	12287
2012-12-31	12298
2013-03-31	13098
2013-06-30	11385
2013-09-30	12844
2013-12-31	12626
2014-03-31	12649
2014-06-30	14035
2014-09-30	14232
2014-12-31	14741
2015-03-31	15002
2015-06-30	18430
2015-09-30	20185
2015-12-31	14515
2016-03-31	14989
2016-06-30	13447
2016-09-30	15461
2016-12-31	15052
2017-03-31	15826
2017-06-30	19055
2017-09-30	17702
2017-12-31	14950
2018-03-31	16788
2018-06-30	15622
2018-09-30	16779
2018-12-31	18967
2019-03-31	16677
2019-06-30	17507
2019-09-30	15643
2019-12-31	17430
2020-03-31	17698
2020-06-30	16061
2020-09-30	17263
2020-12-31	19017
2021-03-31	18416
2021-06-30	18988
2021-09-30	18567
2021-12-31	17838
2022-03-31	19256
2022-06-30	17828
2022-09-30	20884
2022-12-31	21237
2023-03-31	23531
2023-06-30	22421
2023-09-30	20224