Quarterly US dollars
1986-09-30 52310
1986-12-31 52730
1987-03-31 61332
1987-06-30 66155
1987-09-30 71192
1987-12-31 88689
1988-03-31 90392
1988-06-30 86003
1988-09-30 90804
1988-12-31 86563
1989-03-31 89314
1989-06-30 83531
1989-09-30 90078
1989-12-31 90312
1990-03-31 85704
1990-06-30 84128
1990-09-30 89451
1990-12-31 92754
1991-03-31 79886
1991-06-30 80732
1991-09-30 84555
1991-12-31 83407
1992-03-31 76346
1992-06-30 75135
1992-09-30 73807
1992-12-31 69646
1993-03-31 75099
1993-06-30 74264
1993-09-30 78295
1993-12-31 75388
1994-03-31 87048
1994-06-30 86915
1994-09-30 96091
1994-12-31 92305
1995-03-31 121369
1995-06-30 108959
1995-09-30 114034
1995-12-31 118742
1996-03-31 113417
1996-06-30 122498
1996-09-30 115900
1996-12-31 126237
1997-03-31 131198
1997-06-30 142910
1997-09-30 145175
1997-12-31 186238
1998-03-31 164042
1998-06-30 174112
1998-09-30 209860
1998-12-31 221658
1999-03-31 168719
1999-06-30 159264
1999-09-30 189090
1999-12-31 199525
2000-03-31 222417
2000-06-30 221572
2000-09-30 220555
2000-12-31 222119
2001-03-31 185092
2001-06-30 195757
2001-09-30 170521
2001-12-31 163628
2002-03-31 161798
2002-06-30 169044
2002-09-30 181789
2002-12-31 183047
2003-03-31 181896
2003-06-30 164759
2003-09-30 181850
2003-12-31 171642
2004-03-31 177877
2004-06-30 186577
2004-09-30 209238
2004-12-31 237340
2005-03-31 217184
2005-06-30 226125
2005-09-30 207188
2005-12-31 219569
2006-03-31 206610
2006-06-30 202289
2006-09-30 192909
2006-12-31 213220
2007-03-31 230426
2007-06-30 239358
2007-09-30 296904
2007-12-31 347164
2008-03-31 451945
2008-06-30 340160
2008-09-30 350227
2008-12-31 292116
2009-03-31 212225
2009-06-30 253005
2009-09-30 254765
2009-12-31 198888
2010-03-31 189345
2010-06-30 192377
2010-09-30 189204
2010-12-31 192470
2011-03-31 189791
2011-06-30 191478
2011-09-30 209821
2011-12-31 223818
2012-03-31 201996
2012-06-30 203500
2012-09-30 204283
2012-12-31 190266
2013-03-31 188904
2013-06-30 174984
2013-09-30 181888
2013-12-31 177167
2014-03-31 162523
2014-06-30 170554
2014-09-30 159873
2014-12-31 165624
2015-03-31 146553
2015-06-30 127863
2015-09-30 121835
2015-12-31 138950