Quarter	US dollars
1999-09-30	62684
1999-12-31	62537
2000-03-31	60962
2000-06-30	74120
2000-09-30	83885
2000-12-31	94125
2001-03-31	117205
2001-06-30	100599
2001-09-30	126293
2001-12-31	136111
2002-03-31	104725
2002-06-30	171962
2002-09-30	218264
2002-12-31	243549
2003-03-31	248573
2003-06-30	295289
2003-09-30	281313
2003-12-31	278107
2004-03-31	290279
2004-06-30	225555
2004-09-30	259244
2004-12-31	293203
2005-03-31	275089
2005-06-30	353418
2005-09-30	332987
2005-12-31	301979
2006-03-31	308382
2006-06-30	378585
2006-09-30	304362
2006-12-31	290701
2007-03-31	377772
2007-06-30	514282
2007-09-30	580775
2007-12-31	736406
2008-03-31	1192341
2008-06-30	1241649
2008-09-30	1147697
2008-12-31	2117746
2009-03-31	1511443
2009-06-30	1091797
2009-09-30	1082724
2009-12-31	903041
2010-03-31	902729
2010-06-30	1008995
2010-09-30	1168375
2010-12-31	992851
2011-03-31	784745
2011-06-30	850305
2011-09-30	1154004
2011-12-31	1062771
2012-03-31	1003238
2012-06-30	965658
2012-09-30	761241
2012-12-31	755765
2013-03-31	699530
2013-06-30	600695
2013-09-30	535778
2013-12-31	509725
2014-03-31	402900
2014-06-30	600043
2014-09-30	634385
2014-12-31	732774
2015-03-31	775333
2015-06-30	599415
2015-09-30	634064
2015-12-31	547457
2016-03-31	648556
2016-06-30	677934
2016-09-30	609077
2016-12-31	499753
2017-03-31	401925
2017-06-30	390529
2017-09-30	379175
2017-12-31	373388
2018-03-31	366559
2018-06-30	282643
2018-09-30	319699
2018-12-31	336991
2019-03-31	335016
2019-06-30	370877
2019-09-30	459408
2019-12-31	391214
2020-03-31	558066
2020-06-30	493327
2020-09-30	490472
2020-12-31	516882
2021-03-31	443088
2021-06-30	389001
2021-09-30	366490
2021-12-31	356185
2022-03-31	378263
2022-06-30	423058
2022-09-30	489817
2022-12-31	383958
2023-03-31	334698
2023-06-30	359851
2023-09-30	372408