Bi-annual	US dollars
1987-06-30	27063
1987-12-31	33430
1988-06-30	32444
1988-12-31	31076
1989-06-30	33283
1989-12-31	36014
1990-06-30	37137
1990-12-31	41309
1991-06-30	34040
1991-12-31	37434
1992-06-30	40266
1992-12-31	38063
1993-06-30	46143
1993-12-31	49418
1994-06-30	53410
1994-12-31	61305
1995-06-30	61958
1995-12-31	54741
1996-06-30	63606
1996-12-31	59270
1997-06-30	71622
1997-12-31	69349
1998-06-30	75590
1998-12-31	80368
1999-06-30	94192