Bi-annual	US dollars
1987-06-30	6
1987-12-31	9
1988-06-30	9
1988-12-31	13
1989-06-30	14
1989-12-31	10
1990-06-30	12
1990-12-31	15
1991-06-30	15
1991-12-31	17
1992-06-30	29
1992-12-31	36
1993-06-30	47
1993-12-31	59
1994-06-30	105
1994-12-31	81
1995-06-30	95
1995-12-31	116
1996-06-30	166
1996-12-31	163
1997-06-30	85
1997-12-31	58
1998-06-30	115
1998-12-31	153
1999-06-30	123