Bi-annual	US dollars
1987-06-30	384
1987-12-31	313
1988-06-30	275
1988-12-31	441
1989-06-30	321
1989-12-31	340
1990-06-30	242
1990-12-31	220
1991-06-30	190
1991-12-31	445
1992-06-30	755
1992-12-31	503
1993-06-30	935
1993-12-31	1244
1994-06-30	946
1994-12-31	1274
1995-06-30	1233
1995-12-31	1276
1996-06-30	1673
1996-12-31	1846
1997-06-30	1604
1997-12-31	2152
1998-06-30	2674
1998-12-31	2954
1999-06-30	3327