Bi-annual	US dollars
1987-06-30	1017
1987-12-31	1334
1988-06-30	1351
1988-12-31	1828
1989-06-30	1166
1989-12-31	627
1990-06-30	487
1990-12-31	727
1991-06-30	475
1991-12-31	622
1992-06-30	561
1992-12-31	476
1993-06-30	399
1993-12-31	368
1994-06-30	310
1994-12-31	289
1995-06-30	275
1995-12-31	223
1996-06-30	291
1996-12-31	286
1997-06-30	230
1997-12-31	160
1998-06-30	203
1998-12-31	205
1999-06-30	159