Bi-annual	US dollars
1987-06-30	218
1987-12-31	276
1988-06-30	232
1988-12-31	237
1989-06-30	251
1989-12-31	316
1990-06-30	310
1990-12-31	338
1991-06-30	347
1991-12-31	454
1992-06-30	729
1992-12-31	512
1993-06-30	578
1993-12-31	542
1994-06-30	588
1994-12-31	601
1995-06-30	612
1995-12-31	695
1996-06-30	763
1996-12-31	615
1997-06-30	727
1997-12-31	758
1998-06-30	709
1998-12-31	672
1999-06-30	514