Quarter	US dollars
1999-03-31	566403
1999-06-30	581968
1999-09-30	539642
1999-12-31	442390
2000-03-31	502702
2000-06-30	515393
2000-09-30	480017
2000-12-31	473561
2001-03-31	554099
2001-06-30	510687
2001-09-30	564041
2001-12-31	535768
2002-03-31	517939
2002-06-30	609322
2002-09-30	671912
2002-12-31	768594
2003-03-31	893276
2003-06-30	991267
2003-09-30	970669
2003-12-31	1072244
2004-03-31	1127651
2004-06-30	1140980
2004-09-30	1208038
2004-12-31	1295066
2005-03-31	1388636
2005-06-30	1341383
2005-09-30	1360561
2005-12-31	1277713
2006-03-31	1426204
2006-06-30	1540240
2006-09-30	1539390
2006-12-31	1600572
2007-03-31	1851390
2007-06-30	1955852
2007-09-30	2088683
2007-12-31	2168312
2008-03-31	2439113
2008-06-30	2230129
2008-09-30	2024052
2008-12-31	1930210
2009-03-31	1860965
2009-06-30	1883700
2009-09-30	1917917
2009-12-31	1907965
2010-03-31	1879394
2010-06-30	1697243
2010-09-30	1868548
2010-12-31	1747009
2011-03-31	1922576
2011-06-30	1952253
2011-09-30	1969088
2011-12-31	1795310
2012-03-31	1963036
2012-06-30	1854011
2012-09-30	1795340
2012-12-31	1794996
2013-03-31	1719516
2013-06-30	1671685
2013-09-30	1599153
2013-12-31	1585424
2014-03-31	1631351
2014-06-30	1644732
2014-09-30	1527261
2014-12-31	1437939
2015-03-31	1368648
2015-06-30	1317450
2015-09-30	1283648
2015-12-31	1190701