Quarter	US dollars
1999-03-31	615690
1999-06-30	641980
1999-09-30	614458
1999-12-31	550256
2000-03-31	617287
2000-06-30	627089
2000-09-30	597399
2000-12-31	638203
2001-03-31	730960
2001-06-30	686019
2001-09-30	717140
2001-12-31	680891
2002-03-31	667048
2002-06-30	770055
2002-09-30	823236
2002-12-31	900957
2003-03-31	1028226
2003-06-30	1115482
2003-09-30	1127351
2003-12-31	1215043
2004-03-31	1279048
2004-06-30	1294110
2004-09-30	1375422
2004-12-31	1467992
2005-03-31	1527377
2005-06-30	1521120
2005-09-30	1540487
2005-12-31	1476003
2006-03-31	1621722
2006-06-30	1731293
2006-09-30	1765562
2006-12-31	1819622
2007-03-31	2038813
2007-06-30	2170621
2007-09-30	2353792
2007-12-31	2498933
2008-03-31	2792460
2008-06-30	2582939
2008-09-30	2350817
2008-12-31	2169448
2009-03-31	2054700
2009-06-30	2192962
2009-09-30	2212739
2009-12-31	2093688
2010-03-31	2077817
2010-06-30	2013573
2010-09-30	2217853
2010-12-31	2025727
2011-03-31	2142772
2011-06-30	2163441
2011-09-30	2196389
2011-12-31	2070752
2012-03-31	2261059
2012-06-30	2178363
2012-09-30	2121109
2012-12-31	2078256
2013-03-31	1965755
2013-06-30	1878881
2013-09-30	1761679
2013-12-31	1699621
2014-03-31	1738389
2014-06-30	1674757
2014-09-30	1550919
2014-12-31	1491333
2015-03-31	1450805
2015-06-30	1428405
2015-09-30	1424565
2015-12-31	1347161