<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM STATEMENTS 
OF ASSETS AND LIABILITIES; STATEMENT OF OPERATIONS; STATEMENT OF CHANGES IN NET 
ASSETS; STATEMENT OF CASH FLOWS; PER SHARE TABLE; SCHEDULE OF INVESTMENTS AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                      215,915,936
<INVESTMENTS-AT-VALUE>                     199,706,879
<RECEIVABLES>                                2,375,487
<ASSETS-OTHER>                              33,571,491
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             235,653,857
<PAYABLE-FOR-SECURITIES>                     1,947,971
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,414,457
<TOTAL-LIABILITIES>                          3,362,428
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                             0
<SHARES-COMMON-STOCK>                       11,848,275
<SHARES-COMMON-PRIOR>                       11,848,275
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               232,291,429
<DIVIDEND-INCOME>                              334,550
<INTEREST-INCOME>                            1,089,040
<OTHER-INCOME>                              18,422,832
<EXPENSES-NET>                               8,798,071
<NET-INVESTMENT-INCOME>                     11,048,351
<REALIZED-GAINS-CURRENT>                        91,538
<APPREC-INCREASE-CURRENT>                    1,711,305
<NET-CHANGE-FROM-OPS>                       12,759,636
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      12,759,656
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,121,474
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              8,798,071
<AVERAGE-NET-ASSETS>                                 0
<PER-SHARE-NAV-BEGIN>                           18.529
<PER-SHARE-NII>                                  0.933
<PER-SHARE-GAIN-APPREC>                          0.144
<PER-SHARE-DIVIDEND>                             0.028
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                             19.605
<EXPENSE-RATIO>                                  0.039
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>