Bi-annual	US dollars
1987-06-30	224
1987-12-31	251
1988-06-30	211
1988-12-31	206
1989-06-30	180
1989-12-31	187
1990-06-30	167
1990-12-31	120
1991-06-30	109
1991-12-31	106
1992-06-30	86
1992-12-31	112
1993-06-30	218
1993-12-31	248
1994-06-30	188
1994-12-31	214
1995-06-30	245
1995-12-31	223
1996-06-30	370
1996-12-31	435
1997-06-30	487
1997-12-31	974
1998-06-30	974
1998-12-31	1020
1999-06-30	836