Bi-annual	US dollars
1987-06-30	108
1987-12-31	100
1988-06-30	128
1988-12-31	199
1989-06-30	102
1989-12-31	174
1990-06-30	188
1990-12-31	272
1991-06-30	206
1991-12-31	385
1992-06-30	299
1992-12-31	342
1993-06-30	420
1993-12-31	260
1994-06-30	289
1994-12-31	441
1995-06-30	367
1995-12-31	262
1996-06-30	382
1996-12-31	609
1997-06-30	770
1997-12-31	788
1998-06-30	1310
1998-12-31	1481
1999-06-30	861