Bi-annual	US dollars
1987-06-30	787
1987-12-31	815
1988-06-30	529
1988-12-31	336
1989-06-30	617
1989-12-31	345
1990-06-30	513
1990-12-31	459
1991-06-30	375
1991-12-31	344
1992-06-30	344
1992-12-31	248
1993-06-30	578
1993-12-31	429
1994-06-30	492
1994-12-31	418
1995-06-30	391
1995-12-31	499
1996-06-30	461
1996-12-31	894
1997-06-30	1048
1997-12-31	946
1998-06-30	1014
1998-12-31	1165
1999-06-30	1041