Quarterly US dollars
1986-09-30 1140
1986-12-31 1410
1987-03-31 1598
1987-06-30 1549
1987-09-30 1924
1987-12-31 1938
1988-03-31 2083
1988-06-30 2182
1988-09-30 2058
1988-12-31 2121
1989-03-31 1891
1989-06-30 2620
1989-09-30 2461
1989-12-31 2226
1990-03-31 2088
1990-06-30 2159
1990-09-30 2329
1990-12-31 1987
1991-03-31 2037
1991-06-30 1938
1991-09-30 2380
1991-12-31 2212
1992-03-31 1826
1992-06-30 2033
1992-09-30 4236
1992-12-31 2007
1993-03-31 2511
1993-06-30 2776
1993-09-30 2752
1993-12-31 2705
1994-03-31 2472
1994-06-30 2134
1994-09-30 2130
1994-12-31 1655
1995-03-31 1742
1995-06-30 1142
1995-09-30 1391
1995-12-31 854
1996-03-31 1322
1996-06-30 948
1996-09-30 696
1996-12-31 830
1997-03-31 920
1997-06-30 890
1997-09-30 1102
1997-12-31 1403
1998-03-31 112
1998-06-30 356
1998-09-30 682
1998-12-31 255
1999-03-31 175
1999-06-30 831
1999-09-30 108
1999-12-31 269
2000-03-31 283
2000-06-30 488
2000-09-30 576
2000-12-31 644
2001-03-31 423
2001-06-30 495
2001-09-30 540
2001-12-31 513
2002-03-31 443
2002-06-30 761
2002-09-30 487
2002-12-31 918
2003-03-31 805
2003-06-30 328
2003-09-30 571
2003-12-31 273
2004-03-31 348
2004-06-30 154
2004-09-30 650
2004-12-31 301
2005-03-31 593
2005-06-30 1030
2005-09-30 692
2005-12-31 1765
2006-03-31 690
2006-06-30 3520
2006-09-30 3004
2006-12-31 1187
2007-03-31 1457
2007-06-30 1307
2007-09-30 1387
2007-12-31 2895
2008-03-31 3364
2008-06-30 3493
2008-09-30 925
2008-12-31 3088
2009-03-31 2368
2009-06-30 2003
2009-09-30 778
2009-12-31 1079
2010-03-31 1174
2010-06-30 1113
2010-09-30 1482
2010-12-31 426
2011-03-31 582
2011-06-30 537
2011-09-30 2273
2011-12-31 5134
2012-03-31 1734
2012-06-30 918
2012-09-30 1681
2012-12-31 2593
2013-03-31 2275
2013-06-30 3425
2013-09-30 3391
2013-12-31 3075
2014-03-31 3886
2014-06-30 4246
2014-09-30 1837
2014-12-31 3164
2015-03-31 2717
2015-06-30 1902
2015-09-30 2912
2015-12-31 4040