Quarter	US dollars
2004-12-31	21338
2005-03-31	21333
2005-06-30	24147
2005-09-30	22932
2005-12-31	25632
2006-03-31	26007
2006-06-30	27260
2006-09-30	27055
2006-12-31	25768
2007-03-31	25230
2007-06-30	26340
2007-09-30	28538
2007-12-31	30799
2008-03-31	31043
2008-06-30	31342
2008-09-30	29494
2008-12-31	25204
2009-03-31	24162
2009-06-30	15730
2009-09-30	14819
2009-12-31	14813
2010-03-31	15969
2010-06-30	17579
2010-09-30	18150
2010-12-31	18006
2011-03-31	19494
2011-06-30	20030
2011-09-30	19986
2011-12-31	17827
2012-03-31	19145
2012-06-30	18359
2012-09-30	18218
2012-12-31	18881
2013-03-31	19029
2013-06-30	18299
2013-09-30	18644
2013-12-31	18637
2014-03-31	18652
2014-06-30	19248
2014-09-30	19150
2014-12-31	18918
2015-03-31	18986
2015-06-30	18804
2015-09-30	18199
2015-12-31	18167
2016-03-31	18686
2016-06-30	18296
2016-09-30	17612
2016-12-31	16401
2017-03-31	17630
2017-06-30	19528
2017-09-30	19162
2017-12-31	18166
2018-03-31	19593
2018-06-30	19140
2018-09-30	21308
2018-12-31	20885
2019-03-31	22530
2019-06-30	23852
2019-09-30	22849
2019-12-31	23008
2020-03-31	20524
2020-06-30	20652
2020-09-30	20106
2020-12-31	20659
2021-03-31	21242
2021-06-30	22179
2021-09-30	22641
2021-12-31	21220
2022-03-31	22310
2022-06-30	22815
2022-09-30	23100
2022-12-31	23615
2023-03-31	25682
2023-06-30	27247
2023-09-30	27604