Quarterly US dollars
1997-09-30 1388
1997-12-31 1604
1998-03-31 2508
1998-06-30 2002
1998-09-30 2273
1998-12-31 2300
1999-03-31 2416
1999-06-30 2856
1999-09-30 3339
1999-12-31 3469
2000-03-31 3453
2000-06-30 3177
2000-09-30 3187
2000-12-31 3171
2001-03-31 3395
2001-06-30 3505
2001-09-30 3480
2001-12-31 3387
2002-03-31 3118
2002-06-30 3468
2002-09-30 3648
2002-12-31 4074
2003-03-31 3952
2003-06-30 4138
2003-09-30 4136
2003-12-31 4739
2004-03-31 4805
2004-06-30 5166
2004-09-30 5465
2004-12-31 7253
2005-03-31 8655
2005-06-30 8180
2005-09-30 7786
2005-12-31 6451
2006-03-31 7079
2006-06-30 8811
2006-09-30 9061
2006-12-31 10854
2007-03-31 11821
2007-06-30 14701
2007-09-30 18395
2007-12-31 17528
2008-03-31 18373
2008-06-30 17944
2008-09-30 17439
2008-12-31 14309
2009-03-31 14824
2009-06-30 16744
2009-09-30 17109
2009-12-31 15373
2010-03-31 14522
2010-06-30 13514
2010-09-30 14127
2010-12-31 13320
2011-03-31 13800
2011-06-30 13698
2011-09-30 12627
2011-12-31 11982
2012-03-31 12235
2012-06-30 12237
2012-09-30 12074
2012-12-31 11946
2013-03-31 11101
2013-06-30 10615
2013-09-30 11397
2013-12-31 11649
2014-03-31 11249
2014-06-30 12706
2014-09-30 10676
2014-12-31 10386
2015-03-31 8984
2015-06-30 9429
2015-09-30 9719
2015-12-31 9888
2016-03-31 9788
2016-06-30 9278
2016-09-30 9016
2016-12-31 9065
2017-03-31 9332
2017-06-30 9620
2017-09-30 9924
2017-12-31 9557
2018-03-31 11280
2018-06-30 8182
2018-09-30 7522
2018-12-31 6570
2019-03-31 6631
2019-06-30 6533
2019-09-30 6525
2019-12-31 6501
2020-03-31 7110
2020-06-30 7057
2020-09-30 6686
2020-12-31 6317
2021-03-31 6950
2021-06-30 7052
2021-09-30 7154
2021-12-31 6521
2022-03-31 5904
2022-06-30 5314
2022-09-30 4897
2022-12-31 4992
2023-03-31 5699
2023-06-30 5991
2023-09-30 5486