Bi-annual	US dollars
1987-06-30	5
1987-12-31	8
1988-06-30	17
1988-12-31	9
1989-06-30	12
1989-12-31	13
1990-06-30	14
1990-12-31	19
1991-06-30	10
1991-12-31	17
1992-06-30	10
1992-12-31	9
1993-06-30	48
1993-12-31	55
1994-06-30	40
1994-12-31	80
1995-06-30	80
1995-12-31	99
1996-06-30	106
1996-12-31	154
1997-06-30	150
1997-12-31	202
1998-06-30	262
1998-12-31	240
1999-06-30	233