Bi-annual	US dollars
1987-06-30	214
1987-12-31	289
1988-06-30	206
1988-12-31	260
1989-06-30	467
1989-12-31	218
1990-06-30	230
1990-12-31	278
1991-06-30	235
1991-12-31	252
1992-06-30	141
1992-12-31	112
1993-06-30	336
1993-12-31	170
1994-06-30	106
1994-12-31	341
1995-06-30	437
1995-12-31	540
1996-06-30	168
1996-12-31	163
1997-06-30	584
1997-12-31	408
1998-06-30	495
1998-12-31	443
1999-06-30	419