Bi-annual	US dollars
1987-06-30	866
1987-12-31	830
1988-06-30	803
1988-12-31	1210
1989-06-30	952
1989-12-31	876
1990-06-30	881
1990-12-31	625
1991-06-30	735
1991-12-31	1139
1992-06-30	598
1992-12-31	645
1993-06-30	692
1993-12-31	770
1994-06-30	833
1994-12-31	617
1995-06-30	470
1995-12-31	295
1996-06-30	500
1996-12-31	411
1997-06-30	794
1997-12-31	385
1998-06-30	497
1998-12-31	384
1999-06-30	429