Bi-annual	US dollars
1987-06-30	86182
1987-12-31	95960
1988-06-30	91601
1988-12-31	88594
1989-06-30	91301
1989-12-31	96113
1990-06-30	98172
1990-12-31	102669
1991-06-30	89020
1991-12-31	96186
1992-06-30	94798
1992-12-31	94124
1993-06-30	141409
1993-12-31	139792
1994-06-30	150806
1994-12-31	150070
1995-06-30	155193
1995-12-31	156235
1996-06-30	167820
1996-12-31	175370
1997-06-30	204426
1997-12-31	221515
1998-06-30	221337
1998-12-31	196107
1999-06-30	184214