Bi-annual	US dollars
1987-06-30	551
1987-12-31	583
1988-06-30	617
1988-12-31	566
1989-06-30	498
1989-12-31	743
1990-06-30	542
1990-12-31	554
1991-06-30	509
1991-12-31	493
1992-06-30	409
1992-12-31	485
1993-06-30	812
1993-12-31	936
1994-06-30	1137
1994-12-31	1020
1995-06-30	1185
1995-12-31	732
1996-06-30	1176
1996-12-31	940
1997-06-30	1472
1997-12-31	1339
1998-06-30	1309
1998-12-31	2965
1999-06-30	2715