frankfurt feb 23 reuters  the european central bank suffered a loss last year as its own interest rate increases forced it to write down the value of some bonds and fork out billions of euros on balances created during a decade of massive moneyprinting its annual account showed on thursday while the 16 billion loss was entirely covered by provisions it raises questions about whether the ecb might one day run out of such buffers and who will foot the bill of its past largesse now that inflation is back and rates high