Bi-annual	US dollars
1987-06-30	337
1987-12-31	368
1988-06-30	310
1988-12-31	410
1989-06-30	457
1989-12-31	437
1990-06-30	474
1990-12-31	311
1991-06-30	246
1991-12-31	301
1992-06-30	386
1992-12-31	312
1993-06-30	503
1993-12-31	551
1994-06-30	613
1994-12-31	663
1995-06-30	1034
1995-12-31	890
1996-06-30	1116
1996-12-31	1293
1997-06-30	985
1997-12-31	900
1998-06-30	1252
1998-12-31	1657
1999-06-30	1897