Bi-annual	US dollars
1987-06-30	850
1987-12-31	957
1988-06-30	1121
1988-12-31	729
1989-06-30	874
1989-12-31	784
1990-06-30	823
1990-12-31	866
1991-06-30	1101
1991-12-31	745
1992-06-30	898
1992-12-31	317
1993-06-30	570
1993-12-31	225
1994-06-30	315
1994-12-31	332
1995-06-30	332
1995-12-31	284
1996-06-30	289
1996-12-31	813
1997-06-30	1061
1997-12-31	754
1998-06-30	472
1998-12-31	534
1999-06-30	355