Bi-annual	US dollars
1987-06-30	943
1987-12-31	879
1988-06-30	1037
1988-12-31	917
1989-06-30	853
1989-12-31	851
1990-06-30	855
1990-12-31	884
1991-06-30	1028
1991-12-31	984
1992-06-30	1018
1992-12-31	435
1993-06-30	782
1993-12-31	602
1994-06-30	554
1994-12-31	426
1995-06-30	334
1995-12-31	293
1996-06-30	263
1996-12-31	310
1997-06-30	284
1997-12-31	90
1998-06-30	80
1998-12-31	220
1999-06-30	139