Quarterly US dollars
1997-09-30 20553
1997-12-31 17905
1998-03-31 15675
1998-06-30 14881
1998-09-30 15249
1998-12-31 15770
1999-03-31 13538
1999-06-30 13349
1999-09-30 10892
1999-12-31 11907
2000-03-31 8950
2000-06-30 11329
2000-09-30 11173
2000-12-31 14930
2001-03-31 13937
2001-06-30 13887
2001-09-30 16908
2001-12-31 15818
2002-03-31 16172
2002-06-30 17907
2002-09-30 17082
2002-12-31 18596
2003-03-31 17071
2003-06-30 16597
2003-09-30 15394
2003-12-31 16481
2004-03-31 16524
2004-06-30 17398
2004-09-30 18433
2004-12-31 21636
2005-03-31 21427
2005-06-30 21808
2005-09-30 21224
2005-12-31 23077
2006-03-31 23792
2006-06-30 23599
2006-09-30 24201
2006-12-31 26895
2007-03-31 26110
2007-06-30 26796
2007-09-30 26134
2007-12-31 28885
2008-03-31 28375
2008-06-30 26528
2008-09-30 22716
2008-12-31 23985
2009-03-31 21554
2009-06-30 23544
2009-09-30 22606
2009-12-31 22207
2010-03-31 19216
2010-06-30 18048
2010-09-30 21940
2010-12-31 21423
2011-03-31 23709
2011-06-30 28123
2011-09-30 28538
2011-12-31 27519
2012-03-31 28583
2012-06-30 27829
2012-09-30 28730
2012-12-31 29827
2013-03-31 30275
2013-06-30 32129
2013-09-30 33717
2013-12-31 36007
2014-03-31 38043
2014-06-30 38166
2014-09-30 33873
2014-12-31 33934
2015-03-31 40250
2015-06-30 41267
2015-09-30 42848
2015-12-31 43637
2016-03-31 48783
2016-06-30 47946
2016-09-30 49758
2016-12-31 44805
2017-03-31 51542
2017-06-30 57461
2017-09-30 55263
2017-12-31 58572
2018-03-31 62903
2018-06-30 57533
2018-09-30 55984
2018-12-31 71195
2019-03-31 61695
2019-06-30 49505
2019-09-30 51970
2019-12-31 69863
2020-03-31 52933
2020-06-30 46545
2020-09-30 46263
2020-12-31 61631
2021-03-31 47055
2021-06-30 45382
2021-09-30 49152
2021-12-31 49114
2022-03-31 43685
2022-06-30 41264
2022-09-30 39149
2022-12-31 46929
2023-03-31 41755
2023-06-30 39144
2023-09-30 37695
2023-12-31 40255