Quarterly US dollars
1986-09-30 74667
1986-12-31 80522
1987-03-31 87655
1987-06-30 88156
1987-09-30 88373
1987-12-31 103182
1988-03-31 102257
1988-06-30 98663
1988-09-30 98006
1988-12-31 104947
1989-03-31 102832
1989-06-30 107906
1989-09-30 114863
1989-12-31 121446
1990-03-31 138024
1990-06-30 146699
1990-09-30 169737
1990-12-31 172747
1991-03-31 166239
1991-06-30 162602
1991-09-30 172520
1991-12-31 168026
1992-03-31 162933
1992-06-30 177740
1992-09-30 202300
1992-12-31 196974
1993-03-31 215016
1993-06-30 209284
1993-09-30 221881
1993-12-31 219437
1994-03-31 224295
1994-06-30 236104
1994-09-30 242636
1994-12-31 240175
1995-03-31 276719
1995-06-30 284000
1995-09-30 278720
1995-12-31 303920
1996-03-31 315308
1996-06-30 324116
1996-09-30 348393
1996-12-31 349732
1997-03-31 341304
1997-06-30 340642
1997-09-30 357568
1997-12-31 369779
1998-03-31 401346
1998-06-30 433384
1998-09-30 490130
1998-12-31 429589
1999-03-31 94143
1999-06-30 87608
1999-09-30 91182
1999-12-31 89041
2000-03-31 92427
2000-06-30 95652
2000-09-30 99799
2000-12-31 100689
2001-03-31 94429
2001-06-30 100153
2001-09-30 103691
2001-12-31 102399
2002-03-31 111380
2002-06-30 115117
2002-09-30 123229
2002-12-31 125662
2003-03-31 124848
2003-06-30 143274
2003-09-30 145477
2003-12-31 151152
2004-03-31 175558
2004-06-30 171351
2004-09-30 186190
2004-12-31 177812
2005-03-31 186716
2005-06-30 201606
2005-09-30 206508
2005-12-31 202208
2006-03-31 231824
2006-06-30 248743
2006-09-30 264962
2006-12-31 259375
2007-03-31 300845
2007-06-30 317857
2007-09-30 339638
2007-12-31 330383
2008-03-31 372797
2008-06-30 355505
2008-09-30 329187
2008-12-31 261081
2009-03-31 246038
2009-06-30 249358
2009-09-30 264378
2009-12-31 250661
2010-03-31 268577
2010-06-30 252399
2010-09-30 264814
2010-12-31 272030
2011-03-31 281768
2011-06-30 283610
2011-09-30 304042
2011-12-31 277709
2012-03-31 279088
2012-06-30 290181
2012-09-30 310748
2012-12-31 309718
2013-03-31 302592
2013-06-30 280689
2013-09-30 297666
2013-12-31 290172
2014-03-31 294540
2014-06-30 300016
2014-09-30 289958
2014-12-31 271407
2015-03-31 277081
2015-06-30 272365
2015-09-30 262132
2015-12-31 255900