Bi-annual	US dollars
1987-06-30	10
1987-12-31	15
1988-06-30	22
1988-12-31	36
1989-06-30	47
1989-12-31	60
1990-06-30	59
1990-12-31	60
1991-06-30	81
1991-12-31	75
1992-06-30	101
1992-12-31	91
1993-06-30	228
1993-12-31	216
1994-06-30	245
1994-12-31	349
1995-06-30	332
1995-12-31	434
1996-06-30	479
1996-12-31	449
1997-06-30	504
1997-12-31	668
1998-06-30	880
1998-12-31	810
1999-06-30	1044