<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains Summary Financial Information extracted from the Form
N-SAR and the financial statements and is qualified in its entirety by
references to such documents.
</LEGEND>
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          AUG-31-2000
<PERIOD-START>                             SEP-01-1999
<PERIOD-END>                               AUG-31-2000
<INVESTMENTS-AT-COST>                           479819
<INVESTMENTS-AT-VALUE>                          512038
<RECEIVABLES>                                     9005
<ASSETS-OTHER>                                    1226
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  522269
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2121
<TOTAL-LIABILITIES>                               2121
<SENIOR-EQUITY>                                 185000
<PAID-IN-CAPITAL-COMMON>                        302742
<SHARES-COMMON-STOCK>                            21751
<SHARES-COMMON-PRIOR>                            21670
<ACCUMULATED-NII-CURRENT>                          199
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (12)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         32219
<NET-ASSETS>                                    520148
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                30590
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    3888
<NET-INVESTMENT-INCOME>                          26702
<REALIZED-GAINS-CURRENT>                           256
<APPREC-INCREASE-CURRENT>                         3178
<NET-CHANGE-FROM-OPS>                            30136
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        21041
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                 81
<NET-CHANGE-IN-ASSETS>                            4086
<ACCUMULATED-NII-PRIOR>                            778
<ACCUMULATED-GAINS-PRIOR>                        (268)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             3215
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   3930
<AVERAGE-NET-ASSETS>                            507110
<PER-SHARE-NAV-BEGIN>                                0
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                  0
<EXPENSE-RATIO>                                      0


</TABLE>