Bi-annual	US dollars
1987-06-30	30089
1987-12-31	30934
1988-06-30	32074
1988-12-31	36838
1989-06-30	27501
1989-12-31	32855
1990-06-30	29139
1990-12-31	27619
1991-06-30	28195
1991-12-31	32894
1992-06-30	34970
1992-12-31	27959
1993-06-30	31857
1993-12-31	33296
1994-06-30	39929
1994-12-31	38509
1995-06-30	37595
1995-12-31	27650
1996-06-30	28148
1996-12-31	30227
1997-06-30	30830
1997-12-31	30790
1998-06-30	31745
1998-12-31	35287
1999-06-30	32741