Bi-annual	US dollars
1987-06-30	129
1987-12-31	96
1988-06-30	107
1988-12-31	110
1989-06-30	124
1989-12-31	102
1990-06-30	201
1990-12-31	185
1991-06-30	276
1991-12-31	349
1992-06-30	341
1992-12-31	426
1993-06-30	783
1993-12-31	1213
1994-06-30	1602
1994-12-31	1757
1995-06-30	2138
1995-12-31	2822
1996-06-30	3070
1996-12-31	3097
1997-06-30	2797
1997-12-31	2359
1998-06-30	2086
1998-12-31	1764
1999-06-30	1466