Quarter	US dollars
1999-03-31	5454
1999-06-30	5606
1999-09-30	4878
1999-12-31	5528
2000-03-31	5836
2000-06-30	5852
2000-09-30	5689
2000-12-31	7261
2001-03-31	8259
2001-06-30	8617
2001-09-30	10909
2001-12-31	14332
2002-03-31	11908
2002-06-30	13461
2002-09-30	13849
2002-12-31	14200
2003-03-31	14101
2003-06-30	16152
2003-09-30	16346
2003-12-31	28192
2004-03-31	33949
2004-06-30	33463
2004-09-30	29760
2004-12-31	39464
2005-03-31	39972
2005-06-30	40631
2005-09-30	47854
2005-12-31	38845
2006-03-31	39751
2006-06-30	44343
2006-09-30	47314
2006-12-31	60229
2007-03-31	63476
2007-06-30	70851
2007-09-30	85872
2007-12-31	102970
2008-03-31	109258
2008-06-30	111159
2008-09-30	94475
2008-12-31	95156
2009-03-31	75651
2009-06-30	87251
2009-09-30	86909
2009-12-31	70968
2010-03-31	68683
2010-06-30	59708
2010-09-30	72341
2010-12-31	84663
2011-03-31	81242
2011-06-30	90103
2011-09-30	76514
2011-12-31	73868
2012-03-31	80617
2012-06-30	87785
2012-09-30	85792
2012-12-31	91830
2013-03-31	87488
2013-06-30	95066
2013-09-30	74999
2013-12-31	82057
2014-03-31	91860
2014-06-30	88492
2014-09-30	86458
2014-12-31	80184
2015-03-31	80935
2015-06-30	84056
2015-09-30	92805
2015-12-31	107675
2016-03-31	108051
2016-06-30	103837
2016-09-30	107004
2016-12-31	103879
2017-03-31	111859
2017-06-30	118721
2017-09-30	121536
2017-12-31	117210
2018-03-31	128732
2018-06-30	104740
2018-09-30	115670
2018-12-31	116232
2019-03-31	106070
2019-06-30	108431
2019-09-30	120629
2019-12-31	119919
2020-03-31	124865
2020-06-30	114586
2020-09-30	106259
2020-12-31	115159
2021-03-31	112951
2021-06-30	118986
2021-09-30	117844
2021-12-31	123869
2022-03-31	128723
2022-06-30	125203
2022-09-30	123201
2022-12-31	139675
2023-03-31	131971
2023-06-30	130841
2023-09-30	128515