Quarter	US dollars
1999-03-31	1052
1999-06-30	1503
1999-09-30	1684
1999-12-31	1504
2000-03-31	1671
2000-06-30	1657
2000-09-30	1625
2000-12-31	1544
2001-03-31	1917
2001-06-30	2076
2001-09-30	1990
2001-12-31	1820
2002-03-31	2034
2002-06-30	2242
2002-09-30	1941
2002-12-31	1871
2003-03-31	1899
2003-06-30	1802
2003-09-30	2213
2003-12-31	1996
2004-03-31	2593
2004-06-30	2494
2004-09-30	2456
2004-12-31	2653
2005-03-31	3618
2005-06-30	2515
2005-09-30	2757
2005-12-31	2716
2006-03-31	2277
2006-06-30	2329
2006-09-30	2401
2006-12-31	2623
2007-03-31	2411
2007-06-30	2568
2007-09-30	4302
2007-12-31	3317
2008-03-31	3163
2008-06-30	3553
2008-09-30	3201
2008-12-31	4419
2009-03-31	3806
2009-06-30	3533
2009-09-30	3939
2009-12-31	3227
2010-03-31	3500
2010-06-30	3044
2010-09-30	2946
2010-12-31	2813
2011-03-31	3544
2011-06-30	917
2011-09-30	1848
2011-12-31	1938
2012-03-31	3074
2012-06-30	2353
2012-09-30	2190
2012-12-31	1834
2013-03-31	3080
2013-06-30	2063
2013-09-30	2685
2013-12-31	2416
2014-03-31	1505
2014-06-30	2576
2014-09-30	1877
2014-12-31	1767
2015-03-31	1779
2015-06-30	6459
2015-09-30	6584
2015-12-31	2143
2016-03-31	1381
2016-06-30	1147
2016-09-30	1036
2016-12-31	1127
2017-03-31	934
2017-06-30	991
2017-09-30	1011
2017-12-31	1588
2018-03-31	996
2018-06-30	669
2018-09-30	912
2018-12-31	3588
2019-03-31	2546
2019-06-30	3606
2019-09-30	1768
2019-12-31	2672
2020-03-31	3952
2020-06-30	2838
2020-09-30	1420
2020-12-31	3449
2021-03-31	2307
2021-06-30	2292
2021-09-30	1790
2021-12-31	1322
2022-03-31	907
2022-06-30	778
2022-09-30	673
2022-12-31	689
2023-03-31	2246
2023-06-30	1624
2023-09-30	1048