Bi-annual	US dollars
1987-06-30	1814
1987-12-31	2510
1988-06-30	1630
1988-12-31	2081
1989-06-30	986
1989-12-31	1029
1990-06-30	820
1990-12-31	486
1991-06-30	240
1991-12-31	542
1992-06-30	620
1992-12-31	424
1993-06-30	705
1993-12-31	565
1994-06-30	856
1994-12-31	721
1995-06-30	2640
1995-12-31	844
1996-06-30	1230
1996-12-31	1280
1997-06-30	1163
1997-12-31	1938
1998-06-30	1010
1998-12-31	1118
1999-06-30	930