Bi-annual	US dollars
1987-06-30	279
1987-12-31	209
1988-06-30	246
1988-12-31	210
1989-06-30	233
1989-12-31	224
1990-06-30	391
1990-12-31	482
1991-06-30	555
1991-12-31	657
1992-06-30	617
1992-12-31	959
1993-06-30	1519
1993-12-31	1713
1994-06-30	1969
1994-12-31	2192
1995-06-30	2560
1995-12-31	3268
1996-06-30	3356
1996-12-31	4047
1997-06-30	4365
1997-12-31	3666
1998-06-30	2981
1998-12-31	2741
1999-06-30	1805