FHFA report FHFA appear FHFA Federal Housing Finance Agency report FHFA report FHFA Federal Housing Finance Agency several months of decline since February interest rate report FHFA FHFA FHFA source FHFA source FHFA FHFA "Monthy Interest Rate Survey" FHFA source FHFA FHFA FHFA FHFA appear FHFA appear FHFA FHFA FHFA report FHFA FHFA provided FHFA FHFA FHFA FHFA report appear report FHFA FHFA FHFA Federal Housing Finance Agency FHFA appear FHFA FHFA source Monthly Interest Rate Survey appear FHFA Monthly Interest Rate Survey appear