Quarterly US dollars
1997-09-30 137
1997-12-31 171
1998-03-31 179
1998-06-30 310
1998-09-30 687
1998-12-31 1158
1999-03-31 1368
1999-06-30 2081
1999-09-30 4333
1999-12-31 4826
2000-03-31 5002
2000-06-30 4918
2000-09-30 4554
2000-12-31 4962
2001-03-31 4710
2001-06-30 5890
2001-09-30 4855
2001-12-31 5040
2002-03-31 5756
2002-06-30 7413
2002-09-30 8345
2002-12-31 8594
2003-03-31 10264
2003-06-30 11107
2003-09-30 11192
2003-12-31 12170
2004-03-31 12403
2004-06-30 12002
2004-09-30 14078
2004-12-31 16380
2005-03-31 19600
2005-06-30 21623
2005-09-30 21938
2005-12-31 21999
2006-03-31 22420
2006-06-30 21719
2006-09-30 21777
2006-12-31 23606
2007-03-31 20563
2007-06-30 30797
2007-09-30 26056
2007-12-31 31596
2008-03-31 35604
2008-06-30 21785
2008-09-30 14701
2008-12-31 14073
2009-03-31 15279
2009-06-30 19560
2009-09-30 18221
2009-12-31 14187
2010-03-31 21235
2010-06-30 20964
2010-09-30 20926
2010-12-31 21798
2011-03-31 22750
2011-06-30 17489
2011-09-30 21119
2011-12-31 21663
2012-03-31 21472
2012-06-30 23659
2012-09-30 24587
2012-12-31 26224
2013-03-31 21880
2013-06-30 21770
2013-09-30 21809
2013-12-31 21098
2014-03-31 22704
2014-06-30 19389
2014-09-30 22213
2014-12-31 21849
2015-03-31 20568
2015-06-30 21043
2015-09-30 20658
2015-12-31 21084
2016-03-31 20877
2016-06-30 20513
2016-09-30 21166
2016-12-31 11971
2017-03-31 11121
2017-06-30 13767
2017-09-30 17459
2017-12-31 16508
2018-03-31 21612
2018-06-30 19874
2018-09-30 14022
2018-12-31 15785
2019-03-31 9865
2019-06-30 13243
2019-09-30 16191
2019-12-31 16668
2020-03-31 16675
2020-06-30 18442
2020-09-30 18863
2020-12-31 18117
2021-03-31 19071
2021-06-30 8189
2021-09-30 9176
2021-12-31 12022
2022-03-31 13166
2022-06-30 14584
2022-09-30 9997
2022-12-31 12625
2023-03-31 10435
2023-06-30 8121
2023-09-30 8283
2023-12-31 10510