Bi-annual	US dollars
1987-06-30	3222
1987-12-31	2600
1988-06-30	3305
1988-12-31	3605
1989-06-30	3303
1989-12-31	3918
1990-06-30	3287
1990-12-31	3091
1991-06-30	3272
1991-12-31	3003
1992-06-30	2816
1992-12-31	2986
1993-06-30	3358
1993-12-31	4060
1994-06-30	4290
1994-12-31	3285
1995-06-30	4107
1995-12-31	5441
1996-06-30	5065
1996-12-31	5869
1997-06-30	5390
1997-12-31	6441
1998-06-30	5640
1998-12-31	7205
1999-06-30	10744