Quarter	US dollars
1999-03-31	17283
1999-06-30	17143
1999-09-30	16823
1999-12-31	16030
2000-03-31	15340
2000-06-30	15337
2000-09-30	15494
2000-12-31	16945
2001-03-31	15174
2001-06-30	14707
2001-09-30	15116
2001-12-31	14378
2002-03-31	15017
2002-06-30	17193
2002-09-30	16180
2002-12-31	17599
2003-03-31	18653
2003-06-30	16727
2003-09-30	17330
2003-12-31	18629
2004-03-31	20522
2004-06-30	19062
2004-09-30	20510
2004-12-31	21162
2005-03-31	21584
2005-06-30	20827
2005-09-30	22383
2005-12-31	24947
2006-03-31	27556
2006-06-30	27462
2006-09-30	28411
2006-12-31	29299
2007-03-31	28693
2007-06-30	32693
2007-09-30	38138
2007-12-31	55134
2008-03-31	58295
2008-06-30	54627
2008-09-30	59642
2008-12-31	54401
2009-03-31	47097
2009-06-30	48032
2009-09-30	45541
2009-12-31	45192
2010-03-31	43698
2010-06-30	49073
2010-09-30	48312
2010-12-31	52389
2011-03-31	55395
2011-06-30	52757
2011-09-30	51847
2011-12-31	61566
2012-03-31	65990
2012-06-30	59742
2012-09-30	61974
2012-12-31	70860
2013-03-31	65725
2013-06-30	61471
2013-09-30	69558
2013-12-31	58811
2014-03-31	73471
2014-06-30	66456
2014-09-30	75250
2014-12-31	81689
2015-03-31	81996
2015-06-30	88832
2015-09-30	89650
2015-12-31	100560
2016-03-31	90771
2016-06-30	88864
2016-09-30	89826
2016-12-31	90660
2017-03-31	90163
2017-06-30	87638
2017-09-30	91100
2017-12-31	94122
2018-03-31	105667
2018-06-30	101661
2018-09-30	101763
2018-12-31	101049
2019-03-31	103884
2019-06-30	115539
2019-09-30	111988
2019-12-31	117309
2020-03-31	110438
2020-06-30	105835
2020-09-30	110411
2020-12-31	117363
2021-03-31	122365
2021-06-30	122276
2021-09-30	120637
2021-12-31	129391
2022-03-31	128361
2022-06-30	128661
2022-09-30	131495
2022-12-31	126028
2023-03-31	122776
2023-06-30	125748
2023-09-30	121584