Bi-annual	US dollars
1987-06-30	1575
1987-12-31	1796
1988-06-30	1499
1988-12-31	1275
1989-06-30	1859
1989-12-31	1645
1990-06-30	849
1990-12-31	722
1991-06-30	731
1991-12-31	742
1992-06-30	851
1992-12-31	732
1993-06-30	1395
1993-12-31	936
1994-06-30	991
1994-12-31	1355
1995-06-30	1351
1995-12-31	1405
1996-06-30	1128
1996-12-31	1168
1997-06-30	1236
1997-12-31	1185
1998-06-30	1267
1998-12-31	1165
1999-06-30	1714