Bi-annual	US dollars
1987-06-30	492
1987-12-31	183
1988-06-30	194
1988-12-31	219
1989-06-30	217
1989-12-31	243
1990-06-30	298
1990-12-31	359
1991-06-30	203
1991-12-31	385
1992-06-30	352
1992-12-31	262
1993-06-30	417
1993-12-31	627
1994-06-30	594
1994-12-31	455
1995-06-30	495
1995-12-31	450
1996-06-30	569
1996-12-31	507
1997-06-30	569
1997-12-31	946
1998-06-30	985
1998-12-31	927
1999-06-30	806