Bi-annual	US dollars
1987-06-30	232
1987-12-31	168
1988-06-30	111
1988-12-31	184
1989-06-30	191
1989-12-31	300
1990-06-30	223
1990-12-31	251
1991-06-30	238
1991-12-31	116
1992-06-30	249
1992-12-31	108
1993-06-30	375
1993-12-31	372
1994-06-30	495
1994-12-31	654
1995-06-30	625
1995-12-31	758
1996-06-30	1106
1996-12-31	1787
1997-06-30	1918
1997-12-31	3786
1998-06-30	4712
1998-12-31	6515
1999-06-30	7094