Quarter	US dollars
1999-03-31	169845
1999-06-30	159089
1999-09-30	161915
1999-12-31	162801
2000-03-31	183191
2000-06-30	187265
2000-09-30	177848
2000-12-31	200446
2001-03-31	238174
2001-06-30	210652
2001-09-30	216936
2001-12-31	188550
2002-03-31	180672
2002-06-30	191081
2002-09-30	204179
2002-12-31	217012
2003-03-31	223248
2003-06-30	249000
2003-09-30	235654
2003-12-31	278991
2004-03-31	296751
2004-06-30	285895
2004-09-30	296395
2004-12-31	298835
2005-03-31	324808
2005-06-30	298003
2005-09-30	303023
2005-12-31	260252
2006-03-31	310869
2006-06-30	311869
2006-09-30	304300
2006-12-31	289155
2007-03-31	336020
2007-06-30	329950
2007-09-30	378988
2007-12-31	336929
2008-03-31	432611
2008-06-30	377318
2008-09-30	390092
2008-12-31	374807
2009-03-31	322351
2009-06-30	350355
2009-09-30	312345
2009-12-31	310618
2010-03-31	307162
2010-06-30	319627
2010-09-30	341816
2010-12-31	326120
2011-03-31	310186
2011-06-30	294708
2011-09-30	381635
2011-12-31	291831
2012-03-31	496494
2012-06-30	439773
2012-09-30	441822
2012-12-31	385881
2013-03-31	313227
2013-06-30	294863
2013-09-30	248245
2013-12-31	219893
2014-03-31	238894
2014-06-30	217549
2014-09-30	209746
2014-12-31	208249
2015-03-31	226958
2015-06-30	234937
2015-09-30	228499
2015-12-31	232494
2016-03-31	244647
2016-06-30	296470
2016-09-30	306806
2016-12-31	311496
2017-03-31	336588
2017-06-30	343469
2017-09-30	328790
2017-12-31	351333
2018-03-31	357535
2018-06-30	365773
2018-09-30	360227
2018-12-31	284610
2019-03-31	327372
2019-06-30	338561
2019-09-30	348420
2019-12-31	266839
2020-03-31	318913
2020-06-30	343244
2020-09-30	397988
2020-12-31	395220
2021-03-31	501475
2021-06-30	519385
2021-09-30	476633
2021-12-31	450708
2022-03-31	500810
2022-06-30	482002
2022-09-30	465589
2022-12-31	430893
2023-03-31	473965
2023-06-30	453974
2023-09-30	411257