Bi-annual	US dollars
1987-06-30	722
1987-12-31	813
1988-06-30	733
1988-12-31	560
1989-06-30	612
1989-12-31	600
1990-06-30	567
1990-12-31	272
1991-06-30	212
1991-12-31	248
1992-06-30	181
1992-12-31	250
1993-06-30	588
1993-12-31	392
1994-06-30	316
1994-12-31	277
1995-06-30	383
1995-12-31	389
1996-06-30	424
1996-12-31	253
1997-06-30	371
1997-12-31	387
1998-06-30	445
1998-12-31	501
1999-06-30	459