Quarter	US dollars
1999-03-31	1040
1999-06-30	1315
1999-09-30	1706
1999-12-31	1387
2000-03-31	1446
2000-06-30	1478
2000-09-30	1570
2000-12-31	1512
2001-03-31	1498
2001-06-30	1481
2001-09-30	1683
2001-12-31	1329
2002-03-31	1375
2002-06-30	1876
2002-09-30	1487
2002-12-31	1577
2003-03-31	1516
2003-06-30	1851
2003-09-30	1860
2003-12-31	1832
2004-03-31	2006
2004-06-30	1852
2004-09-30	2044
2004-12-31	2311
2005-03-31	1887
2005-06-30	1986
2005-09-30	1909
2005-12-31	2177
2006-03-31	2397
2006-06-30	2706
2006-09-30	2701
2006-12-31	2835
2007-03-31	2739
2007-06-30	2578
2007-09-30	3221
2007-12-31	3231
2008-03-31	1665
2008-06-30	2350
2008-09-30	2448
2008-12-31	1750
2009-03-31	1401
2009-06-30	1174
2009-09-30	1249
2009-12-31	1145
2010-03-31	1660
2010-06-30	1946
2010-09-30	1706
2010-12-31	1965
2011-03-31	1947
2011-06-30	2115
2011-09-30	2122
2011-12-31	2245
2012-03-31	1941
2012-06-30	1881
2012-09-30	1566
2012-12-31	1528
2013-03-31	1902
2013-06-30	1933
2013-09-30	1752
2013-12-31	2086
2014-03-31	2007
2014-06-30	3119
2014-09-30	3219
2014-12-31	3021
2015-03-31	2279
2015-06-30	2261
2015-09-30	2383
2015-12-31	2098
2016-03-31	1772
2016-06-30	1893
2016-09-30	1915
2016-12-31	2189
2017-03-31	1998
2017-06-30	1687
2017-09-30	2043
2017-12-31	2213
2018-03-31	2125
2018-06-30	1489
2018-09-30	1584
2018-12-31	1245
2019-03-31	2138
2019-06-30	2312
2019-09-30	2141
2019-12-31	1635
2020-03-31	1980
2020-06-30	2038
2020-09-30	2062
2020-12-31	1917
2021-03-31	1411
2021-06-30	1698
2021-09-30	2122
2021-12-31	3172
2022-03-31	2566
2022-06-30	2228
2022-09-30	2484
2022-12-31	2154
2023-03-31	2443
2023-06-30	2482
2023-09-30	2490