Bi-annual	US dollars
1987-06-30	56
1987-12-31	94
1988-06-30	123
1988-12-31	268
1989-06-30	124
1989-12-31	129
1990-06-30	152
1990-12-31	172
1991-06-30	206
1991-12-31	291
1992-06-30	371
1992-12-31	298
1993-06-30	938
1993-12-31	606
1994-06-30	843
1994-12-31	986
1995-06-30	1223
1995-12-31	1302
1996-06-30	1558
1996-12-31	1584
1997-06-30	1862
1997-12-31	2405
1998-06-30	2574
1998-12-31	2421
1999-06-30	2592