Quarter	US dollars
1999-03-31	26932
1999-06-30	19970
1999-09-30	22873
1999-12-31	26483
2000-03-31	28581
2000-06-30	29442
2000-09-30	24069
2000-12-31	30183
2001-03-31	26869
2001-06-30	27064
2001-09-30	25822
2001-12-31	28893
2002-03-31	28436
2002-06-30	31124
2002-09-30	36240
2002-12-31	35256
2003-03-31	30118
2003-06-30	22507
2003-09-30	21260
2003-12-31	21999
2004-03-31	29696
2004-06-30	31260
2004-09-30	48498
2004-12-31	61801
2005-03-31	62739
2005-06-30	69174
2005-09-30	43349
2005-12-31	34741
2006-03-31	56051
2006-06-30	40030
2006-09-30	37266
2006-12-31	66097
2007-03-31	73114
2007-06-30	50164
2007-09-30	62550
2007-12-31	66559
2008-03-31	114890
2008-06-30	51473
2008-09-30	62813
2008-12-31	37367
2009-03-31	27561
2009-06-30	37597
2009-09-30	31912
2009-12-31	34961
2010-03-31	27351
2010-06-30	36312
2010-09-30	33084
2010-12-31	25074
2011-03-31	28706
2011-06-30	26114
2011-09-30	33711
2011-12-31	51413
2012-03-31	47203
2012-06-30	41013
2012-09-30	37909
2012-12-31	28013
2013-03-31	33927
2013-06-30	35888
2013-09-30	41618
2013-12-31	40915
2014-03-31	36860
2014-06-30	38481
2014-09-30	39520
2014-12-31	42980
2015-03-31	35731
2015-06-30	27141
2015-09-30	29277
2015-12-31	30250
2016-03-31	33614
2016-06-30	49675
2016-09-30	44211
2016-12-31	39201
2017-03-31	36199
2017-06-30	30250
2017-09-30	44055
2017-12-31	20526
2018-03-31	34939
2018-06-30	30959
2018-09-30	44634
2018-12-31	43227
2019-03-31	49873
2019-06-30	35437
2019-09-30	38931
2019-12-31	33678
2020-03-31	51842
2020-06-30	28495
2020-09-30	36724
2020-12-31	35490
2021-03-31	44333
2021-06-30	33693
2021-09-30	41146
2021-12-31	23250
2022-03-31	43826
2022-06-30	33038
2022-09-30	36096
2022-12-31	38125
2023-03-31	49841
2023-06-30	43036
2023-09-30	44457