Bi-annual	US dollars
1987-06-30	52093
1987-12-31	62029
1988-06-30	60027
1988-12-31	60949
1989-06-30	64642
1989-12-31	66925
1990-06-30	75738
1990-12-31	86600
1991-06-30	71054
1991-12-31	81242
1992-06-30	86067
1992-12-31	86882
1993-06-30	104058
1993-12-31	100554
1994-06-30	111600
1994-12-31	108189
1995-06-30	111922
1995-12-31	105203
1996-06-30	111706
1996-12-31	109079
1997-06-30	134883
1997-12-31	162416
1998-06-30	188045
1998-12-31	209764
1999-06-30	225911