Bi-annual	US dollars
1987-06-30	150
1987-12-31	204
1988-06-30	160
1988-12-31	130
1989-06-30	150
1989-12-31	124
1990-06-30	134
1990-12-31	162
1991-06-30	120
1991-12-31	148
1992-06-30	99
1992-12-31	83
1993-06-30	104
1993-12-31	52
1994-06-30	82
1994-12-31	117
1995-06-30	143
1995-12-31	169
1996-06-30	185
1996-12-31	243
1997-06-30	278
1997-12-31	230
1998-06-30	297
1998-12-31	275
1999-06-30	361