Quarter	US dollars
1999-03-31	274043
1999-06-30	276499
1999-09-30	280829
1999-12-31	287736
2000-03-31	285688
2000-06-30	284905
2000-09-30	281448
2000-12-31	316203
2001-03-31	305204
2001-06-30	290309
2001-09-30	295720
2001-12-31	326940
2002-03-31	299213
2002-06-30	301106
2002-09-30	307647
2002-12-31	327710
2003-03-31	342046
2003-06-30	358104
2003-09-30	345852
2003-12-31	382141
2004-03-31	437575
2004-06-30	408411
2004-09-30	451988
2004-12-31	495702
2005-03-31	470911
2005-06-30	491190
2005-09-30	455515
2005-12-31	491580
2006-03-31	538927
2006-06-30	546761
2006-09-30	561787
2006-12-31	625097
2007-03-31	695625
2007-06-30	726258
2007-09-30	828613
2007-12-31	878533
2008-03-31	950893
2008-06-30	848599
2008-09-30	798304
2008-12-31	757707
2009-03-31	717983
2009-06-30	687933
2009-09-30	609803
2009-12-31	565920
2010-03-31	520959
2010-06-30	504023
2010-09-30	541449
2010-12-31	521283
2011-03-31	478757
2011-06-30	469397
2011-09-30	702721
2011-12-31	697877
2012-03-31	645897
2012-06-30	461299
2012-09-30	463139
2012-12-31	459165
2013-03-31	416556
2013-06-30	416961
2013-09-30	425571
2013-12-31	439582
2014-03-31	425771
2014-06-30	453194
2014-09-30	440795
2014-12-31	450882
2015-03-31	448154
2015-06-30	413409
2015-09-30	396252
2015-12-31	393573
2016-03-31	386021
2016-06-30	373160
2016-09-30	426605
2016-12-31	404766
2017-03-31	376182
2017-06-30	353385
2017-09-30	423600
2017-12-31	431260
2018-03-31	411295
2018-06-30	375291
2018-09-30	332264
2018-12-31	336589
2019-03-31	325079
2019-06-30	331673
2019-09-30	324058
2019-12-31	383485
2020-03-31	347132
2020-06-30	332385
2020-09-30	344610
2020-12-31	349939
2021-03-31	338582
2021-06-30	354222
2021-09-30	360352
2021-12-31	378295
2022-03-31	407188
2022-06-30	417466
2022-09-30	442713
2022-12-31	401341
2023-03-31	390156
2023-06-30	405425
2023-09-30	391629