Quarter	US dollars
1999-03-31	204530
1999-06-30	198502
1999-09-30	224346
1999-12-31	243390
2000-03-31	266457
2000-06-30	260564
2000-09-30	270927
2000-12-31	320835
2001-03-31	290635
2001-06-30	263071
2001-09-30	269020
2001-12-31	284105
2002-03-31	289095
2002-06-30	322785
2002-09-30	338419
2002-12-31	363021
2003-03-31	394907
2003-06-30	426268
2003-09-30	412713
2003-12-31	484002
2004-03-31	532548
2004-06-30	548519
2004-09-30	544375
2004-12-31	560504
2005-03-31	583555
2005-06-30	601857
2005-09-30	576824
2005-12-31	571402
2006-03-31	668607
2006-06-30	763040
2006-09-30	741115
2006-12-31	726219
2007-03-31	899908
2007-06-30	862707
2007-09-30	930739
2007-12-31	988772
2008-03-31	1010712
2008-06-30	828496
2008-09-30	756123
2008-12-31	620441
2009-03-31	605748
2009-06-30	603988
2009-09-30	654722
2009-12-31	593037
2010-03-31	605970
2010-06-30	626707
2010-09-30	689915
2010-12-31	645186
2011-03-31	594766
2011-06-30	649106
2011-09-30	619506
2011-12-31	658687
2012-03-31	688240
2012-06-30	672477
2012-09-30	662536
2012-12-31	624674
2013-03-31	591255
2013-06-30	555400
2013-09-30	538723
2013-12-31	546598
2014-03-31	545624
2014-06-30	587113
2014-09-30	601201
2014-12-31	578585
2015-03-31	555688
2015-06-30	496928
2015-09-30	494264
2015-12-31	469030
2016-03-31	449236
2016-06-30	464864
2016-09-30	472433
2016-12-31	435774
2017-03-31	411954
2017-06-30	428454
2017-09-30	440293
2017-12-31	436363
2018-03-31	456297
2018-06-30	451015
2018-09-30	421019
2018-12-31	446761
2019-03-31	434715
2019-06-30	417758
2019-09-30	432737
2019-12-31	423725
2020-03-31	464554
2020-06-30	444291
2020-09-30	462736
2020-12-31	449181
2021-03-31	493892
2021-06-30	477559
2021-09-30	488372
2021-12-31	487133
2022-03-31	513510
2022-06-30	492855
2022-09-30	486533
2022-12-31	469851
2023-03-31	475472
2023-06-30	453269
2023-09-30	452811