Bi-annual	US dollars
1987-06-30	269
1987-12-31	217
1988-06-30	406
1988-12-31	47
1989-06-30	39
1989-12-31	71
1990-06-30	150
1990-12-31	191
1991-06-30	156
1991-12-31	191
1992-06-30	303
1992-12-31	280
1993-06-30	198
1993-12-31	303
1994-06-30	347
1994-12-31	346
1995-06-30	185
1995-12-31	91
1996-06-30	113
1996-12-31	228
1997-06-30	301
1997-12-31	416
1998-06-30	393
1998-12-31	602
1999-06-30	626