Bi-annual	US dollars
1987-06-30	610
1987-12-31	504
1988-06-30	462
1988-12-31	414
1989-06-30	535
1989-12-31	361
1990-06-30	534
1990-12-31	369
1991-06-30	538
1991-12-31	611
1992-06-30	940
1992-12-31	665
1993-06-30	1663
1993-12-31	2499
1994-06-30	2194
1994-12-31	2613
1995-06-30	2870
1995-12-31	3278
1996-06-30	3002
1996-12-31	2614
1997-06-30	3029
1997-12-31	2787
1998-06-30	3288
1998-12-31	3125
1999-06-30	2189