Quarterly US dollars
1986-09-30 20666
1986-12-31 21870
1987-03-31 26791
1987-06-30 27453
1987-09-30 31897
1987-12-31 37197
1988-03-31 40130
1988-06-30 44034
1988-09-30 47014
1988-12-31 44726
1989-03-31 38361
1989-06-30 41263
1989-09-30 41193
1989-12-31 41509
1990-03-31 44164
1990-06-30 49856
1990-09-30 55086
1990-12-31 57761
1991-03-31 51377
1991-06-30 42131
1991-09-30 42483
1991-12-31 45361
1992-03-31 43066
1992-06-30 53399
1992-09-30 67391
1992-12-31 52467
1993-03-31 50167
1993-06-30 50072
1993-09-30 48722
1993-12-31 56066
1994-03-31 55289
1994-06-30 54954
1994-09-30 61193
1994-12-31 68861
1995-03-31 70774
1995-06-30 78015
1995-09-30 72720
1995-12-31 73917
1996-03-31 75214
1996-06-30 73398
1996-09-30 81481
1996-12-31 97189
1997-03-31 107016
1997-06-30 120311
1997-09-30 118268
1997-12-31 139485
1998-03-31 146683
1998-06-30 141786
1998-09-30 155084
1998-12-31 159167
1999-03-31 155662
1999-06-30 144426
1999-09-30 150426
1999-12-31 137616
2000-03-31 162886
2000-06-30 159221
2000-09-30 164021
2000-12-31 161237
2001-03-31 170176
2001-06-30 148173
2001-09-30 176266
2001-12-31 172697
2002-03-31 165252
2002-06-30 173003
2002-09-30 172125
2002-12-31 179747
2003-03-31 176073
2003-06-30 198431
2003-09-30 199567
2003-12-31 230773
2004-03-31 283309
2004-06-30 277969
2004-09-30 229322
2004-12-31 236563
2005-03-31 263944
2005-06-30 255608
2005-09-30 258876
2005-12-31 283945
2006-03-31 304769
2006-06-30 360478
2006-09-30 346835
2006-12-31 412134
2007-03-31 578364
2007-06-30 585441
2007-09-30 590143
2007-12-31 646388
2008-03-31 665028
2008-06-30 570335
2008-09-30 508729
2008-12-31 438596
2009-03-31 456756
2009-06-30 481146
2009-09-30 371596
2009-12-31 363448
2010-03-31 353419
2010-06-30 353218
2010-09-30 357099
2010-12-31 313268
2011-03-31 278637
2011-06-30 282339
2011-09-30 272608
2011-12-31 233586
2012-03-31 248128
2012-06-30 238490
2012-09-30 249695
2012-12-31 240222
2013-03-31 207307
2013-06-30 219879
2013-09-30 228202
2013-12-31 219862
2014-03-31 214981
2014-06-30 212483
2014-09-30 206528
2014-12-31 194544
2015-03-31 194492
2015-06-30 213290
2015-09-30 214224
2015-12-31 196767