LONDON--(BUSINESS WIRE)--Fitch Ratings has assigned 'B-' senior unsecured debt ratings to Jamaica's USD1.35 billion in bonds maturing on 28 April 2028 and USD650 million of bonds maturing on 28 July 2045. The government will use the proceeds to finance the buyback of bilateral sovereign external debt accumulated under the Petrocaribe concessional financing programme, and for budget financing. KEY RATING DRIVERS Jamaica's 'B-' rating is driven by its very high government debt burden, low growth,