Bi-annual	US dollars
1987-06-30	252
1987-12-31	72
1988-06-30	96
1988-12-31	123
1989-06-30	110
1989-12-31	103
1990-06-30	145
1990-12-31	160
1991-06-30	227
1991-12-31	233
1992-06-30	421
1992-12-31	221
1993-06-30	461
1993-12-31	205
1994-06-30	194
1994-12-31	293
1995-06-30	153
1995-12-31	174
1996-06-30	297
1996-12-31	317
1997-06-30	541
1997-12-31	1259
1998-06-30	1417
1998-12-31	1551
1999-06-30	1682