Quarter	US dollars
1986-09-30	550
1986-12-31	687
1987-03-31	777
1987-06-30	932
1987-09-30	828
1987-12-31	1048
1988-03-31	1195
1988-06-30	1138
1988-09-30	1206
1988-12-31	1267
1989-03-31	1307
1989-06-30	1199
1989-09-30	1462
1989-12-31	1428
1990-03-31	1403
1990-06-30	1275
1990-09-30	1448
1990-12-31	1393
1991-03-31	1219
1991-06-30	1075
1991-09-30	1126
1991-12-31	1301
1992-03-31	1152
1992-06-30	1094
1992-09-30	2923
1992-12-31	2350
1993-03-31	4517
1993-06-30	2950
1993-09-30	6678
1993-12-31	11602
1994-03-31	911
1994-06-30	4798
1994-09-30	6694
1994-12-31	6247
1995-03-31	1318
1995-06-30	7276
1995-09-30	7085
1995-12-31	8057
1996-03-31	203
1996-06-30	4348
1996-09-30	3097
1996-12-31	1643
1997-03-31	4054
1997-06-30	282
1997-09-30	427
1997-12-31	329
1998-03-31	364
1998-06-30	72
1998-09-30	89
1998-12-31	109
1999-03-31	166
1999-06-30	668
1999-09-30	234
1999-12-31	377
2000-03-31	338
2000-06-30	172
2000-09-30	880
2000-12-31	1643
2001-03-31	2095
2001-06-30	1534
2001-09-30	2071
2001-12-31	944
2002-03-31	860
2002-06-30	1062
2002-09-30	1139
2002-12-31	861
2003-03-31	1679
2003-06-30	1399
2003-09-30	530
2003-12-31	820
2004-03-31	3390
2004-06-30	1887
2004-09-30	2512
2004-12-31	1887
2005-03-31	5637
2005-06-30	7742
2005-09-30	5991
2005-12-31	9404
2006-03-31	9384
2006-06-30	11801
2006-09-30	9854
2006-12-31	11503
2007-03-31	18220
2007-06-30	17505
2007-09-30	20773
2007-12-31	22194
2008-03-31	13922
2008-06-30	22912
2008-09-30	19519
2008-12-31	9028
2009-03-31	9248
2009-06-30	10607
2009-09-30	7373
2009-12-31	9076
2010-03-31	8219
2010-06-30	5019
2010-09-30	3563
2010-12-31	3809
2011-03-31	6586
2011-06-30	6014
2011-09-30	6383
2011-12-31	2362
2012-03-31	7286
2012-06-30	2408
2012-09-30	7083
2012-12-31	3089
2013-03-31	9351
2013-06-30	3866
2013-09-30	3443
2013-12-31	7486
2014-03-31	2231
2014-06-30	4318
2014-09-30	4916
2014-12-31	5212
2015-03-31	4875
2015-06-30	6674
2015-09-30	5810
2015-12-31	6714