Bi-annual	US dollars
1987-06-30	72566
1987-12-31	85172
1988-06-30	82884
1988-12-31	77332
1989-06-30	81852
1989-12-31	83540
1990-06-30	87514
1990-12-31	91184
1991-06-30	76399
1991-12-31	84137
1992-06-30	85534
1992-12-31	84639
1993-06-30	120903
1993-12-31	121793
1994-06-30	133745
1994-12-31	140742
1995-06-30	145798
1995-12-31	150097
1996-06-30	153878
1996-12-31	160194
1997-06-30	187716
1997-12-31	197795
1998-06-30	197870
1998-12-31	191164
1999-06-30	197316