Bi-annual	US dollars
1987-06-30	106
1987-12-31	111
1988-06-30	102
1988-12-31	85
1989-06-30	20
1989-12-31	23
1990-06-30	31
1990-12-31	50
1991-06-30	65
1991-12-31	35
1992-06-30	95
1992-12-31	53
1993-06-30	108
1993-12-31	149
1994-06-30	191
1994-12-31	214
1995-06-30	283
1995-12-31	347
1996-06-30	418
1996-12-31	443
1997-06-30	609
1997-12-31	548
1998-06-30	664
1998-12-31	634
1999-06-30	818