Jyske Bank launched the world's first negative interest rate mortgage. It belongs to which country?

Denmark's third-largest bank Jyske Bank launched the world's first negative interest rate mortgage. The bank handling out loans to homeowners where the charge is minus 0.5% a year. It has begun offering borrowers a 10-year deal at -0.5%. Jyske bank borrowers will make a monthly repayment, as usual, The amount still outstanding will be reduced each month by more than the borrower.