Bi-annual	US dollars
1987-06-30	37
1987-12-31	36
1988-06-30	26
1988-12-31	31
1989-06-30	34
1989-12-31	32
1990-06-30	35
1990-12-31	33
1991-06-30	29
1991-12-31	32
1992-06-30	32
1992-12-31	41
1993-06-30	42
1993-12-31	50
1994-06-30	59
1994-12-31	89
1995-06-30	118
1995-12-31	129
1996-06-30	131
1996-12-31	116
1997-06-30	120
1997-12-31	118
1998-06-30	150
1998-12-31	156
1999-06-30	136