Quarterly US dollars
1999-09-30 175
1999-12-31 64
2000-03-31 142
2000-06-30 20
2000-09-30 9
2000-12-31 16
2001-03-31 74
2001-06-30 7
2001-09-30 13
2001-12-31 12
2002-03-31 73
2002-06-30 16
2002-09-30 4
2002-12-31 4
2003-03-31 4
2003-06-30 7
2003-09-30 3
2003-12-31 1
2004-03-31 1
2004-06-30 1
2004-09-30 4
2004-12-31 2
2005-03-31 7
2005-06-30 7
2005-09-30 2
2005-12-31 9
2006-03-31 2
2006-06-30 10
2006-09-30 10
2006-12-31 3
2007-03-31 2
2007-06-30 2
2007-09-30 2
2007-12-31 13
2008-03-31 3
2008-06-30 4
2008-09-30 4
2008-12-31 4
2009-03-31 1
2009-06-30 2
2009-09-30 2
2009-12-31 1
2010-03-31 2
2010-06-30 2
2010-09-30 4
2010-12-31 3
2011-03-31 2
2011-06-30 1
2011-09-30 1
2011-12-31 1
2012-03-31 2
2012-06-30 2
2012-09-30 2
2012-12-31 5
2013-03-31 0
2013-06-30 0
2013-09-30 -1
2013-12-31 170
2014-03-31 513
2014-06-30 1226
2014-09-30 1683
2014-12-31 2114
2015-03-31 2219
2015-06-30 2100
2015-09-30 2124
2015-12-31 1794
2016-03-31 2067
2016-06-30 2634
2016-09-30 1854
2016-12-31 2455
2017-03-31 2255
2017-06-30 3303
2017-09-30 4920
2017-12-31 5144
2018-03-31 5844
2018-06-30 5948
2018-09-30 5817
2018-12-31 4989
2019-03-31 5155
2019-06-30 4786
2019-09-30 4681
2019-12-31 4449
2020-03-31 3982
2020-06-30 4055
2020-09-30 5311
2020-12-31 4687
2021-03-31 6923
2021-06-30 7473
2021-09-30 4035
2021-12-31 6319
2022-03-31 3360
2022-06-30 2358
2022-09-30 2817
2022-12-31 3593
2023-03-31 4451
2023-06-30 3368
2023-09-30 3139
2023-12-31 4177