Bi-annual	US dollars
1987-06-30	132
1987-12-31	189
1988-06-30	123
1988-12-31	89
1989-06-30	26
1989-12-31	15
1990-06-30	9
1990-12-31	33
1991-06-30	16
1991-12-31	22
1992-06-30	42
1992-12-31	108
1993-06-30	110
1993-12-31	142
1994-06-30	185
1994-12-31	1195
1995-06-30	1295
1995-12-31	795
1996-06-30	194
1996-12-31	308
1997-06-30	231
1997-12-31	518
1998-06-30	854
1998-12-31	491
1999-06-30	347