Quarter	US dollars
1999-03-31	1797
1999-06-30	1852
1999-09-30	1943
1999-12-31	2840
2000-03-31	2495
2000-06-30	2694
2000-09-30	2851
2000-12-31	2908
2001-03-31	2979
2001-06-30	3061
2001-09-30	3318
2001-12-31	3746
2002-03-31	3545
2002-06-30	4096
2002-09-30	4276
2002-12-31	4523
2003-03-31	4321
2003-06-30	4729
2003-09-30	4815
2003-12-31	5230
2004-03-31	5439
2004-06-30	5997
2004-09-30	5959
2004-12-31	6502
2005-03-31	8484
2005-06-30	7745
2005-09-30	7627
2005-12-31	6530
2006-03-31	8598
2006-06-30	9238
2006-09-30	12029
2006-12-31	10266
2007-03-31	14429
2007-06-30	15701
2007-09-30	15990
2007-12-31	18584
2008-03-31	19348
2008-06-30	17720
2008-09-30	16964
2008-12-31	14255
2009-03-31	13614
2009-06-30	14427
2009-09-30	14719
2009-12-31	14389
2010-03-31	13291
2010-06-30	13007
2010-09-30	13727
2010-12-31	11997
2011-03-31	11408
2011-06-30	9276
2011-09-30	8224
2011-12-31	9089
2012-03-31	10112
2012-06-30	9174
2012-09-30	10096
2012-12-31	10463
2013-03-31	10019
2013-06-30	9322
2013-09-30	10159
2013-12-31	10210
2014-03-31	11144
2014-06-30	11459
2014-09-30	12355
2014-12-31	12974
2015-03-31	13222
2015-06-30	11971
2015-09-30	13601
2015-12-31	12372
2016-03-31	13608
2016-06-30	12299
2016-09-30	14425
2016-12-31	13925
2017-03-31	14892
2017-06-30	18065
2017-09-30	16691
2017-12-31	13361
2018-03-31	15792
2018-06-30	14953
2018-09-30	15867
2018-12-31	15379
2019-03-31	14130
2019-06-30	13901
2019-09-30	13875
2019-12-31	14757
2020-03-31	13746
2020-06-30	13223
2020-09-30	15843
2020-12-31	15568
2021-03-31	16109
2021-06-30	16696
2021-09-30	16776
2021-12-31	16515
2022-03-31	18349
2022-06-30	17050
2022-09-30	20211
2022-12-31	20547
2023-03-31	21285
2023-06-30	20798
2023-09-30	19177