Genworth's performance in the September quarter shows a continuation of the trends the mortgage insurer reported in the June half - falling premium income and a higher loss ratio contributing to lower earnings.Genworth Mortgage Insurance Australia reported gross written premium of A$92.5 million for the September quarter, which was down 25.8 per cent on the same period last year.  The company's loss ratio rose 11.8 per cent to 45.3 per cent over the same period.The number of portfolio delinquencies rose 1040 to 6844 - an eight basis point increase in the delinquency rate to 47 bps.Net profit for the quarter was down 28.7 per cent to $46.7 million and underlying profit was down 19.3 per cent to $47.4 million.Genworth chief executive Georgette Nicholas said in a statement: "Queensland and Western Australia continue to have elevated delinquency development from economic pressure, in particular mining related regions."Last week Genworth had a win when it renewed its contract with Commonwealth Bank.