Quarter	US dollars
1997-09-30	71210
1997-12-31	83271
1998-03-31	80840
1998-06-30	86219
1998-09-30	84283
1998-12-31	84969
1999-03-31	86183
1999-06-30	89032
1999-09-30	85826
1999-12-31	84035
2000-03-31	83701
2000-06-30	83681
2000-09-30	84300
2000-12-31	89975
2001-03-31	89290
2001-06-30	89874
2001-09-30	102319
2001-12-31	105722
2002-03-31	104560
2002-06-30	117395
2002-09-30	119712
2002-12-31	134578
2003-03-31	137854
2003-06-30	142794
2003-09-30	148377
2003-12-31	153909
2004-03-31	161244
2004-06-30	167635
2004-09-30	176975
2004-12-31	190678
2005-03-31	194108
2005-06-30	191171
2005-09-30	197441
2005-12-31	203120
2006-03-31	208496
2006-06-30	234384
2006-09-30	249407
2006-12-31	289218
2007-03-31	302685
2007-06-30	334806
2007-09-30	410204
2007-12-31	406008
2008-03-31	412374
2008-06-30	448274
2008-09-30	432070
2008-12-31	353754
2009-03-31	330584
2009-06-30	336042
2009-09-30	306652
2009-12-31	295989
2010-03-31	301780
2010-06-30	275924
2010-09-30	305080
2010-12-31	288084
2011-03-31	262607
2011-06-30	259677
2011-09-30	251287
2011-12-31	235013
2012-03-31	246963
2012-06-30	230857
2012-09-30	234943
2012-12-31	228171
2013-03-31	211450
2013-06-30	229164
2013-09-30	229275
2013-12-31	230184
2014-03-31	214080
2014-06-30	211583
2014-09-30	198384
2014-12-31	177704
2015-03-31	176749
2015-06-30	170139
2015-09-30	154190
2015-12-31	157084
2016-03-31	155715
2016-06-30	154661
2016-09-30	153964
2016-12-31	149363
2017-03-31	158002
2017-06-30	142693
2017-09-30	145963
2017-12-31	150205
2018-03-31	153867
2018-06-30	153815
2018-09-30	144626
2018-12-31	135052
2019-03-31	128031
2019-06-30	131366
2019-09-30	143800
2019-12-31	153403
2020-03-31	141404
2020-06-30	142556
2020-09-30	140429
2020-12-31	137060
2021-03-31	130440
2021-06-30	132319
2021-09-30	127696
2021-12-31	127630
2022-03-31	130126
2022-06-30	127210
2022-09-30	126493
2022-12-31	131938
2023-03-31	135286
2023-06-30	138906
2023-09-30	139013