Bi-annual	US dollars
1987-06-30	306
1987-12-31	249
1988-06-30	271
1988-12-31	226
1989-06-30	226
1989-12-31	176
1990-06-30	248
1990-12-31	156
1991-06-30	89
1991-12-31	162
1992-06-30	299
1992-12-31	217
1993-06-30	1118
1993-12-31	1290
1994-06-30	1509
1994-12-31	2212
1995-06-30	2090
1995-12-31	1746
1996-06-30	2298
1996-12-31	2837
1997-06-30	3435
1997-12-31	2600
1998-06-30	3503
1998-12-31	3360
1999-06-30	2581