Bi-annual	US dollars
1987-06-30	40
1987-12-31	17
1988-06-30	39
1988-12-31	132
1989-06-30	47
1989-12-31	110
1990-06-30	150
1990-12-31	174
1991-06-30	198
1991-12-31	346
1992-06-30	312
1992-12-31	327
1993-06-30	437
1993-12-31	220
1994-06-30	225
1994-12-31	275
1995-06-30	220
1995-12-31	245
1996-06-30	346
1996-12-31	462
1997-06-30	722
1997-12-31	706
1998-06-30	1294
1998-12-31	1536
1999-06-30	1219