Bi-annual	US dollars
1987-06-30	237
1987-12-31	185
1988-06-30	157
1988-12-31	116
1989-06-30	169
1989-12-31	166
1990-06-30	209
1990-12-31	276
1991-06-30	334
1991-12-31	286
1992-06-30	331
1992-12-31	186
1993-06-30	395
1993-12-31	550
1994-06-30	611
1994-12-31	757
1995-06-30	1487
1995-12-31	1837
1996-06-30	1832
1996-12-31	1881
1997-06-30	2128
1997-12-31	1828
1998-06-30	1569
1998-12-31	1211
1999-06-30	1173