Bi-annual	US dollars
1987-06-30	169
1987-12-31	149
1988-06-30	155
1988-12-31	506
1989-06-30	409
1989-12-31	482
1990-06-30	185
1990-12-31	230
1991-06-30	337
1991-12-31	334
1992-06-30	257
1992-12-31	224
1993-06-30	162
1993-12-31	368
1994-06-30	272
1994-12-31	122
1995-06-30	215
1995-12-31	253
1996-06-30	249
1996-12-31	591
1997-06-30	602
1997-12-31	214
1998-06-30	223
1998-12-31	276
1999-06-30	274